Go to bed at the same time every day
Keeping sleep to regular times is linked to a lower risk of early death, more strongly than total hours slept.
Sunday night you tell yourself you will be asleep by 11:00. It is past midnight when you put the phone down, and on Tuesday you are in bed by 10:00 because you are worn out. A bedtime that moves around every night leaves your body clock guessing. This habit asks one small thing of you: head to bed at the same time, every night, weekends included.
What it helps with
Irregular bedtimes
Keeping sleep to regular times is linked to a lower risk of early death, more strongly than total hours slept.
Key facts
- 1In about 60,000 UK adults, the most regular sleepers had a 20 to 48% lower risk of early death than the least regular.
- 2In that UK study, sleep regularity predicted risk of death better than how long people slept.
- 3Middle-aged and older US adults with the most irregular sleep had about twice the risk of cardiovascular events over about five years.
Why a steady bedtime matters
Your body runs on an internal clock, a roughly 24-hour rhythm that times sleepiness, alertness, hunger and body temperature. That clock takes its cues from when you see light, eat, get up and go to sleep. Researchers call the gap between your weekday and weekend sleep timing "social jet lag", and it is common among working adults. Staying up three hours later on Saturday shifts your clock much like flying across a continent.
You can't fall asleep on command, so this habit is about going to bed at a set time, not about sleeping at one. Getting into bed is the part you control.
How a regular night helps
When your nights start at a similar hour, your body learns what to expect. Melatonin, the hormone linked to sleepiness, rises in the evening, and its timing depends partly on when you saw light that morning. A steady bedtime and a steady wake time work together, which is why this habit pairs well with getting up at the same time each day.
What the research found
In a large UK study, researchers tracked the sleep of about 60,000 adults with wrist-worn activity monitors for a week. People with the most regular sleep patterns had a 20 to 48% lower risk of dying during follow-up than those with the least regular patterns. Regularity predicted risk of death better than sleep length did. A US study of nearly 2,000 middle-aged and older adults found a similar pattern for the heart. Those whose sleep length varied most from night to night had about twice the risk of heart attacks, strokes and related events over about five years.
These studies measured whole sleep patterns, not bedtime alone. They are also observational, so they show links and can't prove that regular timing caused the difference. People with irregular sleep may differ in health, work or stress in ways researchers could not fully measure. Any benefit you notice may be modest and take a few weeks.
Making it stick
Count back from your wake time to leave enough hours for sleep, then pick a bedtime you can keep on Friday and Saturday too. Staying within about 30 minutes of it is a reasonable target. Set a reminder for your bedtime, and start your wind-down when it goes off rather than when you feel tired. After a late night out, go back to your usual time the next evening instead of making up for it. If you regularly lie awake for long stretches, snore loudly or feel sleepy all day despite a steady schedule, see a doctor, since a fixed bedtime won't fix insomnia or sleep apnea. What time could you realistically be in bed next Saturday?
Action steps
- 1Choose one bedtime for all seven nights. Count back from your wake time, and pick a time you can keep on weekends too.
- 2Start when the reminder goes off. Finish what you are doing, brush your teeth and turn off the main lights.
- 3Go back to it after a late night. Keep your usual bedtime the next evening instead of going to bed much earlier.
Suggested routines
- Irregular sleep schedule
Wake up at the same time every day
Going to bed and waking at regular times is linked to a lower risk of early death, more strongly than total hours slept.
- Trouble falling asleep
Get 10 minutes of outdoor light after waking
People who get more bright light in the morning tend to fall asleep faster at night.
- Poor sleep quality
Stop drinking coffee 9 hours before bed
Studies show mistimed caffeine use reduces total sleep by about 45 minutes and deep sleep by 11.4 minutes.
References
- Windred, D. P., et al. (2024). Sleep regularity is a stronger predictor of mortality risk than sleep duration: A prospective cohort study. Sleep, 47(1), zsad253. doi.org/10.1093/sleep/zsad253
- Huang, T., et al. (2020). Sleep irregularity and risk of cardiovascular events: The Multi-Ethnic Study of Atherosclerosis. Journal of the American College of Cardiology, 75(9), 991-999. doi.org/10.1016/j.jacc.2019.12.054
- Wittmann, M., et al. (2006). Social jetlag: Misalignment of biological and social time. Chronobiology International, 23(1-2), 497-509. doi.org/10.1080/07420520500545979