What and Why of Sleep

What is Sleep?

We spend a significant portion of our days and our lives sleeping. It might be the activity that we spend the most time on. But what is it? It is one of those aspects of life that we are so used to that we give little thought to. However, sleep is mentioned as one of the core pillars of a healthy lifestyle alongside other elements such as proper nutrition and exercise. Sleep quality and duration have impacts on work stress, general satisfaction with life, and subjective accounts of health and well-being. The importance of sleep is perhaps best appreciated when its absence is felt. There are significant adverse effects on physical, mental, and overall well-being when one is sleep-deprived. Sleep deprivation is affected by the time slept and the quality of sleep. It plays a significant role in determining various aspects of personal well-being.

While much is known about sleep's effects and its extensive role in determining health, defining what sleep is and why it exists remains a puzzle.

Definition

Sleep may be defined as a naturally occurring state of rest. It involves altered brain activity, reduced or practical suspension of consciousness of the surrounding environment, and relaxation of muscles involved in posture. In this state, the brain does not react to most external stimuli. Closing the eyes during sleep helps establish this state, which may explain how important visual stimuli are for wakefulness. Furthermore, the natural sleep cycle involves sleeping at night. Visual stimuli are limited during this period since there is little or no light.

If they want me to work for more hours, why don't they just make the day have more hours? - koala

This may raise some additional questions: why did we evolve to sleep? Sleep must be necessary, given the time we spend doing it. Therefore, its risks, such as the likelihood of being devoured by a predator while asleep at night, must be lower than the benefits of sleep. Also, how common is sleep among mammals or in the animal kingdom? Sleep is ubiquitous in the animal kingdom in almost all but the simplest organisms without a brain or those with a rudimentary brain. Given the variety of ecosystems in which animals that sleep live, one may suggest that sleep does not require a narrow set of conditions. From penguins in Antarctica to the guanacos in the Atacama, nature has bestowed these organisms with the ability to enjoy the benefits of sleep regardless of their environment.

Sleep Stages

While it may be tempting to think of sleep as one uniform state that one falls in, we have established that sleep has several phases. The sleep cycle has four stages. The first stage is short. It is non-REM – it does not involve rapid eye movement (REM). In this stage, the brain activities slow down, and it is easy to wake someone up in this stage. It often lasts about seven minutes. It is followed by another stage that is also non-REM. In this stage, which lasts up to 25 minutes, the body becomes more relaxed. The body temperature drops and the muscles relax. The breathing rate and heart rate slows. The third stage involves deep sleep. The body relaxes further and may last up to 40 minutes. It is also non-REM. The fourth stage is REM sleep. It lasts up to an hour. As you can see, the sum of all the times in each stage is less than the eight hours we should sleep in a twenty-four-hour period—one cycles through these stages throughout the night.

During REM sleep, there is significant brain activity alongside temporary paralysis. Most muscles are paralyzed except the eyes and those that control breathing. Even when the eyes are closed, there is considerable eye movement. As a result, this stage gets its name – rapid eye movement. But why do eyes need to move even when shut during this stage? This stage is believed to be essential for brain functions such as memory, cognitive, and learning functions. The dreams in this stage are more common and intense than in non-REM stages.

Why do we sleep?

One of the physiological benefits of sleep is allowing for physical restoration. During sleep, energy and resources are directed towards functions such as tissue repair and fostering immunity. During sleep, the body establishes a pattern of healthy hormonal changes, resulting in a healthy balance. Sleep also affects how the body reacts to insulin. Lack of sleep can, therefore, result in higher blood sugar levels and predispose someone to diabetes. Sleep also triggers the release of growth hormones. This is especially crucial in children with much faster growth rates than adults. I do not know if you believed your height grew by a few millimeters when asleep because you could not observe growth during wakefulness. Sleep also helps the brain improve its functions. It develops new pathways to help in learning, memory, and problem-solving.

The brain plays a vital role in determining the cycle of sleep. The hypothalamus controls sleep by processing sensory information about light. As light decreases in the environment, the suprachiasmatic nucleus signals the pineal gland to increase the hormone melatonin, increasing sleep likelihood. During sleep, the thalamus slows down, allowing one to tune out from the world and sleep. However, during REM sleep, activity in the thalamus picks up. The amygdala, which is involved in processing emotions, is also active during REM sleep. The brainstem plays a role in relaxing muscles to enable sleep and prevent that fabled sleepwalking or, worse, working.

Given the importance of sleep for physical and mental health, it is essential to have enough sleep. However, we often fail to achieve the desired level of sleep in quantity and quality. The results can be mild or catastrophic. They range from dull anxiety and mood swings to falling asleep when driving or engaged in other critical activities where the loss of consciousness can be disastrous. It results in trouble learning, focusing, and participating in social relationships. It also exacerbates the likelihood of chronic illnesses such as diabetes, high blood pressure, stroke, obesity, and kidney and heart diseases.

Sleep Disorders

One of the most common sleep disorders is sleep apnea. It arises from the willingness but inability to fall asleep. People with insomnia cannot stay awake during the day or when they are supposed to be active. Sleep apnea is associated with snoring and disruptions to breathing patterns, resulting in a blocked airway. It may result in poor sleep quality. Narcolepsy is a sleep disorder characterized by excessive tiredness that makes one have an overwhelming urge to sleep during the day. This is associated with a disruption in the sleep-wake cycle. It results in sleep attacks that often last for several minutes. Restless legs syndrome occurs due to crawling or tingling sensations in the legs, resulting in movements that make it difficult to sleep. It may be linked to iron deficiency, Parkinson's disease, and pregnancy. Parasomnias refer to unusual sleep behaviors before, during, or when waking up. They include bedwetting, night terrors, and sleepwalking.

Improving Sleep Hygiene

If sleep is so important, why do we wake up at all? - Ignoramus, my roommate.

Sticking to a sleep-wake schedule is one of the best ways to ensure quality sleep every night. Stick to the time you go to bed and wake up. Over time, the internal clock will become so established that you will not need an alarm to wake you up. It is also essential to time your meals well so you are not hungry or stuffed as you go to bed. This may result in discomfort that keeps you up. Also, caffeine, nicotine, and alcohol consumption can disrupt the sleep cycle. Further, the sleep environment should be optimized for sleep. It should be cool, quiet, and dark. Physical activity also helps promote better sleep. Stress management practices such as meditation and journaling can help minimize worries close to bedtime, resulting in better quality sleep.

What would you like to share about your sleep patterns, experiences, and lessons?

Please subscribe for more blogs about sleep. Thank you.

How to Get More Deep Sleep Naturally: 11 Science-Backed Ways to Sleep Better

One of the most significant phases of your whole sleeping cycle is the deep sleep, or the stage N3 sleep. In this phase, the brain waves become slower, the muscles completely relax, the tissues begin to repair, and important memory activities occur. A deep sleep is also the time your body produces growth hormone, works to boost your immunity, and renews your energy supply for the following day. Inauspiciously, numerous individuals cannot afford to get sufficient amounts of it. The interference with your capacity to achieve or sustain deep sleep can come from busyness, late-night screen usage, caffeine intake, and other environmental factors. Without deep sleep, you will feel sleepy, mentally clouded, or even unenthusiastic enough to go to work, even though you have had sufficient sleep time. The positive aspect is that the correct science-based practices allow you to enhance your deep sleep. Here is a step-by-step tutorial on how to have more deep sleep, and how this can be adjust...

Understanding Idiopathic Hypersomnia: The “Invisible” Sleep Disorder

Sleep is essential in both our physical and mental health, but to some individuals, it is not sufficient to have sound sleep. Think of sleeping ten hours at night and still being left feeling like you were exhausted the following day. It is an actual scenario in people who are affected by Idiopathic Hypersomnia (IH). This uncommon yet debilitating sleep disorder is neither understood nor diagnosed correctly. Here, we will discuss IH, its symptoms, causes, diagnosis, treatment, and living with the condition. What is Idiopathic Hypersomnia? Idiopathic Hypersomnia is a persistent neurological sleeping disorder, which is marked by a feeling of excessive daytime sleepiness (EDS) despite sufficient or even excessive nighttime sleep. IH, contrary to the usual exhaustion due to the lifestyle or seasonal lack of sleep, is chronic and can last for many years. The word idiopathic refers to the fact that the cause is unknown, making the disorder especially difficult to comprehend and treat. ...

What Are Night Terrors? Understanding This Mysterious Sleep Disorder

Sleep time is supposed to be a period of rest, recuperation, and revitalization. For some people, the night may come with sudden fright, bewilderment, and agitation. Such a person may awake screaming in the middle of the night, eyes open and their heart racing, without fully realizing what is happening. This is a disturbing experience that most individuals refer to as a night terror. The name itself is dramatic, but night terrors are a real sleeping conditions, which have their basis in the sleep processes of our brain. They do not resemble nightmares, and they usually confuse the individual having them as well as their close ones. To further explain this puzzling sleeping disorder, we shall delve into the definition of night terrors, their cause, their victims, and what can be done to control them. What Are Night Terrors? Night terrors or sleep terrors are characterized as outbursts of extreme fear, screaming, and flailing, and typically happen in non-REM (NREM) deep sleep...

Does Alcohol Help You Sleep? What Research Really Says (And How to Fix It)

'I will just have one drink and then sleep, ' we often tell ourselves. This often becomes three or four before going to bed. You fall asleep fast and believe that it was the alcohol. This might be true, alcohol will help you fall asleep faster, but it gives and it takes. Using it as an over-the-counter sleeping aid might leave you up at 3 a.m., unable to fall back asleep quickly, exhausted the following day, and not even feeling rested after 8 hours of sleep. There are several reasons why this is the case: Alcohol helps you fall asleep — but it destroys sleep quality. The sedating effect only lasts during the first half of the night. The second half becomes fragmented, restless, and low-quality. The more often you drink, the worse your natural sleep systems function over time. Research has shown that alcohol changes brainwave patterns during sleep, reduces restorative deep sleep, suppresses REM sleep and causes early morning awakenings even among moderate or light...

Digital Detox: How Unplugging Before Bed Improves Sleep and Focus

Checking your phone before you put the lights out has become an almost automatic habit. Checking social media for a few seconds, glancing at tomorrow’s emails, or shopping on the Internet for a few minutes does not seem harmful. However, those few minutes can turn into hours, and the screen light is all you get to look at before going to sleep. What you think is a simple habit has an enormous impact on your energy, productivity, and mental health. Studies indicate that watching televisionat night disrupts the normal physical sleep process and does not allow one to rest appropriately. In addition to sleep, it takes away concentration and adds stress to the next day. This is why an increasing number of individuals are welcoming the idea of a digital detox, a period of purposely shutting off technology, and in particular, before going to sleep. This is about establishing healthier relationships with our devices to reclaim higher quality sleep, better concentration, and more relaxed...

15 Reasons Why You Keep Waking Up at Night: Causes, Solutions, and Sleep Hacks That Actually Work

The Importance of a Good Night’s Sleep When you have poor sleep, the brain complains to the HR. You may be irritable, moody, forgetful, emotional, or even feel that everybody is plotting against you (they may not be). With time, chronic sleeplessness leaves you susceptible to various unwanted visitors: hypertension, diabetes, obesity, and cardiovascular disease. Therefore, it is well worth the effort to pursue good quality, consistent sleep. The future you will be will be glad. Here are some reasons why you have poor sleep, and you keep waking up at night, resulting in less sleep and poorer quality sleep. Sleep Apnea Sleep apnea results in a series of interruptions in the breathing system, which wakes you out of sleep (although you might not even recall it). The following day, you may be foggy, irritable, or tired. Although excess weight is a widely recognized reason, it is not the only cause. A physician is capable of diagnosing sleep apnea and prescribing interventions suc...

The Power of a Regular Sleep Schedule: What Research Says About Timing, Health, and Longevity

Most of us consider the number of hours that we get as the more we think about better sleep. It takes between seven and nine hours, huh? However, sleep regularity may be as important, if not a better determinant of sleep quality. The time of the day you go to sleep is as important as the length of time you sleep. If you have had a regular sleep schedule, that is, you go to sleep and wake up at about the same time, you may have learnt that it becomes much easier to fall asleep and wake up. I have often woken up without the help of an alarm when I am on a regular sleep schedule roll. The body develops an internal clock that improves sleep quality. Once this cycle is broken, it becomes challenging to get back. You often regret that one late night. Getting back on track often takes several days or weeks. Therefore, you may be anxious when events threaten to disrupt a regular sleep cycle schedule. In dozens of studies , scientists have discovered that having regular bedtime and wakefuln...

Having Trouble Breathing at Night? A Deep Dive into Common Sleep-Related Breathing Problems and How to Manage Them

I recently had a restless night due to shortness of breath, which made it difficult for me to lie down. After sitting up, the breathing became better. Needless to say, I got little or no sleep that night. Even after being overwhelmed by sleep, the difficulty breathing triggered a powerful reflex that woke me. This breathing reflex is crucial, as it helps ensure that the body receives oxygen and eliminates carbon dioxide even when not fully conscious. However, such breathing problems at night can have adverse effects on sleep quality and quantity, and therefore, overall health and well-being. When we are awake, most of us do not even think about breathing, but when it becomes compromised during sleep, the consequences are enormous. Snoring, sleep apnea , orthopnea , and sudden night shortness of breath are common sleep-related breathing issues that not only disrupt sleep but may also serve as warning signs of more serious health problems. In our blog, we will explore the reasons behin...

Huntington’s Disease Breakthrough: How New Treatments and Better Sleep Could Change the Future

Huntington’s disease is bleakly characterized as ‘the cruelest disease known to man,’ and it has been so described for decades. Families usually passed down the Huntington’s gene while knowing that nothing could halt the disease’s persistent course. Generations all lived with a heavy certainty that it was all over when the symptoms started to manifest themselves through jerking movements, lapses of memory, changes of mood. The illness would progress, and treatments only alleviated some discomfort. This is why the news recently struck such a powerful chord that there is hope for successful therapy. A recent experimental treatment made breakthrough results , and the progression of Huntington’s disease was slowed down in a clinical trial. It was the first time scientists could identify tangible evidence that the progression of the disease could be interrupted. Although this is not a comprehensive cure, the results are a milestone whereby hope will replace inevitability, and come with the...

Search This Blog