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 wakefulness times is helpful in all aspects of mood and metabolism, heart conditions, cognitive health, and even longevity. Conversely, switching between various sleeping patterns, and particularly, the prototypical one where the body is a late night on weekends, and early mornings on weekdays, disrupts the internal clock of the body and results in a chain reaction of lethargy and health consequences.

Why, then, do one or two attempts to change sleeping schedule make it so hard to regain your normal state? Moreover, what is consistency as far as your brain and body are concerned?

The Body Loves Rhythm: The Importance of Consistency

Inside your body, there is a time-keeping system known as the circadian rhythm. This 24-hour cycle informs you of when to be awake, when to feel sleepy, when to digest food, and when to release hormones, such as melatonin (that makes you feel sleepy) and cortisol (that makes you feel awake). Both under and oversleeping disrupt this cycle.

A regular sleeping schedule maintains this rhythm. When you retire to sleep and get up at regular hours:

Your brain secretes melatonin at the right time.
Your metabolism, immune system, and digestive system remain in check.
Your temper and wakefulness are boosted.
Mental activities such as memory and reaction time get refined.

It has been demonstrated in research that those with regular sleep schedules have:

Lower inflammation
Better heart condition
Better glucose regulation
Reduced chances of depression and anxiety
Increased cognitive functioning
Less chance of having metabolic disorders
Improved mood stability

A number of big studies have reported that the regularity of sleep was a better predictor of risk of early mortality than sleep duration. In other words, regular sleepers have a longer life.

What Will Happen with your Violation of the Schedule?

Even though consistency is so good, why does a single late night turn everything upside down? This can be explained by how fragile and powerful the circadian rhythm is.

By sleeping late or sleeping in, you are destroying the schedule of:

Light Exposure - The exposure to morning light establishes the clock of the following 24 hours. Late waking will cause you to miss that morning light window, which will put your internal clock behind schedule.
Hormone Release - Late nights cause changes in the melatonin and cortisol release, and therefore, your body is not in sync the following day. That is why you are too tired in the morning and too wired at night.
Sleep Pressure - The longer you are awake, the sleepier you will become. When you get up late, you do not stay awake long enough to be sleepy at your usual time of bedtime, you will have another late night.
Social Jet Lag - Later bedtimes on weekends and later wake-ups are something that upsets your rhythm, just like a trip across time zones. Researchers refer to this as social jet lag, and it has been attributed to:
- Obesity
- Depression
- Diabetes
- Cognitive decline
- Cardiovascular disease

The way your brain treats inconsistent sleep is just like the way it treats flying from New York to California and back every weekend.

Why It is So Hard to Get Back on Track

When you change your schedule just a little, your body will attempt to defend your new schedule- even when that new schedule is not in your interests.

Here is why:

Delayed Circadian Phase

When you get up late on Sunday, your circadian clock is delayed. Sunday night, you are not too tired to go to bed at your usual hour, so you sleep late again.

Hormones do not change overnight

The timing of melatonin release may require days to re-establish. The same is true of cortisol.

Your Sleep Drive Resets

When you have had more sleep than usual, you accumulate less sleep pressure. As such, you will not be naturally tired when you normally go to bed.

Light exposure reinforces the Shift

Later wakefulness causes the morning sun to enter your eyes, and so shifts your rhythm even later.

How to Recover after Night Outs

We all have those days when we end up going to bed late. In case this occurs, set the goal of waking up on the next day at your usual time. It is best to take a very short nap (not more than 30 minutes) in the early afternoon, though not before 3.00 pm, so as not to interfere with your evening sleep. Never sleep too long on a day off, because excessive sleep to catch up with the lost time can cause a shift in the circadian rhythms, and Mondays are difficult.

Here are a few actions to help recover regularity:

Regularity is always best - A regular wake time and bedtime are essential to health and performance on a daily basis.
Catch-up sleep may be useful - In cases where weekday sleep is inadequate, non-workday additional sleep of 1-2 hours may prove to be beneficial, particularly to metabolic health.
Excessive catch-up sleep may aggravate circadian misalignment. However, going to bed way later than the sunrise means that you will not be exposed to the morning light, and your internal clock will be even later, making Monday that much more challenging.

So the sweet spot is:

1-2 hours max of catch-up sleep
possibly a short nap (less than 30 minutes)
Getting back to your normal bedtime on the same day.

That aids in regaining a small amount of sleep without completely resetting your clock.

How to Be Consistent (Even on Weekends)

Anchor your wake-up time - Wake up early at the same time, despite having a late night. This keeps your circadian clock grounded.
Get bright morning light - Get out of bed within one and a half hours of getting up. The best reset cue for your body is morning sunlight.
Sleep at the same time every evening - Stability is a cue to your brain that you are about to sleep.
Avoid caffeine after noon - Most people have not considered the fact that caffeine slows down their sleep cycle.
Make the room cool, dark, and quiet - Your rhythm is pegged on your surroundings.
Exercise Strategically - Sleep is enhanced by regular exercise, and intense exercise near bedtime may slow down sleep. Identify a routine that suits you.
Track Your Sleep - A sleep journal or an app can track bedtime, wake-up time, and the quality of sleep. Monitoring may assist in determining trends and making corrections.
Be mindful of weekend habits - It may be impossible to avoid late nights. However, avoid sleeping in for more than 1-2 hours.

The Bottom Line

One of the most basic (and most effective) methods to elevate your mood, concentration, metabolic safety, heart activity, and overall health is a regular sleeping schedule. Even a short change in your sleep schedule can cause your circadian rhythm to be disrupted, and thus you can find it difficult to fall asleep, difficult to wake up, and find it difficult to get back to your normal routine. Nevertheless, by making little, consistent decisions and a little planning, you can keep up a routine that supports your health. Consistency in sleeping will result in better thinking, greater energy, and health.

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