We hear a lot about getting seven to nine hours of sleep, but there is another question worth asking: does it matter what time you actually go to bed and wake up?
Increasingly, research suggests it might. There is no scientifically established perfect bedtime for everyone, but several large studies have found better health outcomes among people who consistently fall asleep around 10 to 11 PM and wake around 6 to 7 AM.
That does not mean everyone needs to be in bed by 10 sharp. The bigger takeaway is that sleep timing, sleep duration and consistency all matter, and routinely pushing bedtime much later may not be the same as getting those same eight hours earlier.
What Is the Best Time to Go to Sleep?
One of the largest studies looking at bedtime and heart health analyzed sleep data from more than 100,000 UK Biobank participants.
Published in European Heart Journal Digital Health, the study found that people who fell asleep between 10:00 and 10:59 PM had the lowest incidence of cardiovascular disease.
Those who regularly fell asleep at midnight or later had a 25 percent higher adjusted risk of cardiovascular disease compared with the 10 PM group. Interestingly, going to bed much earlier was not necessarily better either, suggesting there may be a sweet spot rather than a simple rule that earlier is always healthier.
Because this was an observational study, it cannot prove that going to bed at 10 PM prevents heart disease. Still, researchers accounted for factors including sleep duration, sleep irregularity, chronotype, smoking, diabetes and blood pressure, making the pattern worth paying attention to.
What Is the Best Time to Wake Up?
A separate study published in the Journal of Clinical Sleep Medicine looked at both bedtime and wake time.
Researchers found the lowest estimated risk of all cause and cardiovascular mortality around an 11 PM bedtime, while the lowest mortality risk associated with wake time landed around 7 AM.
That does not mean waking at 7:01 suddenly becomes unhealthy. Wake time is tied to everything from work schedules and exercise to daylight exposure and overall health, but the fact that several studies land in a similar window gives us a useful place to start.
And when you wake may only be part of the equation. How you wake up can matter too, particularly when it comes to morning light, cortisol and being jolted out of deeper sleep.
Is 11 PM to 7 AM the Ideal Sleep Schedule?
For someone with a traditional daytime schedule, 11 PM to 7 AM is a very reasonable target. It gives you eight hours of sleep opportunity while keeping most of your sleep within the biological night.
An equally reasonable schedule could be 10:30 PM to 6:30 AM or 10 PM to 6 AM, depending on how much sleep your body actually needs. The important part is not chasing an exact clock time at the expense of getting enough sleep.
The National Heart, Lung, and Blood Institute recommends roughly seven to nine hours of sleep for adults, while the American Academy of Sleep Medicine recommends regularly getting at least seven hours.
If you want to go deeper on why sleep matters beyond simply feeling rested, we recently looked at what the science of sleep tells us about health and performance. For most adults, though, seven to nine hours remains a useful target.
Does Sleeping Late Matter If You Still Get Eight Hours?
It is easy to assume that eight hours from 2 AM to 10 AM is biologically identical to eight hours from 11 PM to 7 AM. Sleep researchers are increasingly questioning that assumption.
Your body does not just measure sleep in hours. Sleep is tied to your circadian rhythm, the internal clock that helps regulate sleepiness, hormones, metabolism, body temperature and alertness throughout the day.
Light is one of the strongest signals controlling that clock. According to the National Heart, Lung, and Blood Institute, bright light earlier in the day can help shift sleep and wake times earlier, while bright light at night can push the circadian system later.
If your sleep schedule has slowly started drifting later, resetting your circadian rhythm can start with something as simple as reconsidering your light exposure throughout the day.
That helps explain why researchers are interested in very late sleep. Going to bed at 2 or 3 AM often means more artificial light late at night and less light exposure early in the morning, which can continue shifting your internal clock later.
What If You Are Naturally a Night Owl?
Chronotype is real. Some people naturally feel sleepy earlier and wake easily in the morning, while others feel more alert and productive later at night.
But being a night owl may not completely erase the effects of consistently late sleep. A 2024 study of nearly 74,000 UK Biobank participants found that later sleep timing was associated with poorer mental health even among people who identified as evening types.
Based on their findings, the researchers suggested avoiding routinely starting sleep after 1 AM. That does not mean every night owl needs to suddenly force a 10 PM bedtime, but regularly drifting into 1, 2 or 3 AM territory may be worth reconsidering.
Of course, sometimes being a night owl has less to do with chronotype and more to do with revenge bedtime procrastination, that very familiar habit of staying up because nighttime finally feels like your own.
Consistency May Matter Just as Much
If there is one sleep habit worth paying more attention to, it is keeping your bedtime and wake time relatively consistent.
A large study published in Sleep analyzed more than 10 million hours of wearable sleep data from nearly 61,000 people. Those with more consistent sleep schedules had significantly lower mortality risk than people with highly irregular sleep patterns.
In the researchers’ models, sleep regularity was actually a stronger predictor of mortality than sleep duration. That does not mean sleep duration suddenly matters less, but it does suggest that healthy sleep is about more than simply hitting an eight hour total.
Another study published in the Journal of the American College of Cardiology found that people whose sleep onset varied by more than 90 minutes from night to night had roughly twice the risk of developing cardiovascular disease compared with those whose sleep timing varied by 30 minutes or less.
Practically, your body likely prefers a fairly consistent 11 PM bedtime over going to bed at 10 PM during the week and 2 AM every weekend.
What a Realistic Sleep Schedule Looks Like
Taken together, the research gives us a surprisingly simple starting point. For most adults with a daytime schedule, aiming to fall asleep around 10:30 to 11 PM and wake around 6:30 to 7 AM is reasonable, adjusting earlier if you need more sleep.
Just as importantly, try to keep that window fairly consistent. You do not need to go to bed at exactly the same minute every night, but regularly shifting your sleep schedule by several hours makes it harder for your circadian rhythm to stay anchored.
Morning light can help too. Getting outside shortly after waking gives your brain a strong daytime signal, while reducing bright lighting and screen exposure later at night can make the transition into sleep easier.
So, What Time Should You Actually Go to Bed?
If you are looking for a practical answer, current research points toward sleeping around 10 to 11 PM and waking around 6 to 7 AM as a strong general range for adults on a traditional daytime schedule.
But the goal is not to obsess over a perfect bedtime. A healthier sleep routine is about getting enough total sleep, keeping your sleep and wake times fairly steady, getting daylight earlier in the day and avoiding making 1 or 2 AM your regular bedtime.
The bigger shift may be thinking beyond the question, “Did I get eight hours?” Research increasingly suggests that when you sleep and how consistently you keep that schedule matter too.
For most of us, that is probably a lot more useful than another sleep hack.
