No, you usually should not check the time when you wake up at night. Research on clock watching and sleep shows that looking at the clock while trying to sleep increases worry and lengthens the time it takes to drift off, and people with insomnia who watch the clock also misjudge how long they have been awake. The time is information you cannot use at 3am, and the mental arithmetic it triggers (“if I fall asleep now I’ll get four hours”) is one of the most reliable ways to wake your brain up further. Turning the clock away is a small change with real evidence behind it.
Here is what the studies found, why a glance at the time does so much, and how to stop, including for the two kinds of nights we think about most: the ones broken by a baby, and the ones broken by perimenopause.
Does clock watching make insomnia worse?
The clearest evidence comes from a pair of experiments published in the Journal of Behavior Therapy and Experimental Psychiatry in 2007. Tang, Schmidt and Harvey asked people to monitor a clock, or not, while trying to fall asleep at home.
In the first experiment, 30 good sleepers and 30 poor sleepers were assigned to watch a clock or not. Those who watched the clock reported more worry before sleep and took longer to fall asleep, and that was true for good and poor sleepers alike. Clock watching was not just a habit of people who already slept badly; it made sleep harder for everyone.
The second experiment focused on 38 people with insomnia. Half monitored a clock, and half monitored a display of numbers that had nothing to do with the time, so both groups had the same task of glancing at something. The clock group found their task more worrying and more disruptive to sleep, showed more pre-sleep worry, and overestimated how long it took them to fall asleep more than the comparison group did. The authors concluded that clock monitoring may help keep insomnia going by feeding worry and by distorting how the night is perceived.
A much larger, more recent study points the same way. In 2023, Dawson and colleagues analysed questionnaires from 4,886 patients at a sleep clinic in the Primary Care Companion for CNS Disorders. Time monitoring behaviour was associated with more severe insomnia, and through that, with greater use of sleep medication. Because the study was observational, it cannot prove that the clock causes the problem on its own, but together with the experiments the picture is consistent.
Why does looking at the clock keep you awake?
Because of what the brain does with the number. Almost nobody looks at the time at night and simply notes it. We calculate: how long until the alarm, how long we have been lying here, how tired tomorrow will feel. Each of those calculations is a small jolt of worry, and worry is arousal.
Allison Harvey’s cognitive model of insomnia, published in Behaviour Research and Therapy in 2002, describes this loop in detail. Worry about sleep raises mental and physical arousal; arousal makes people scan for signs that sleep is not coming; that monitoring finds evidence (the clock says 3:40); the evidence fuels more worry. The clock is the most precise threat-detector in the room, so it becomes the centre of the loop.
There is also a perception problem. People who are anxious about sleep tend to overestimate how long they lie awake and underestimate how long they sleep, a pattern Harvey and Tang reviewed in Psychological Bulletin in 2012. Brief returns to sleep between glances often go unnoticed, so the night feels like one long stretch of wakefulness. Checking the time does not correct that impression; the 2007 experiments suggest it may make it worse.
Finally, there is effort. Colin Espie and colleagues, writing in Sleep Medicine Reviews in 2006, described how sleep tends to fail when we try to make it happen. Sleep is something that arrives when you stop pursuing it. A clock turns the night into a timed task with a deadline, which is the opposite of the conditions sleep needs.
Is it normal to wake up and check the time every night?
Waking in the night is completely normal. Most people surface briefly several times a night, often near the end of a sleep cycle, and usually don’t remember it. Waking up multiple times at night covers the mechanics. What matters is whether you slip back under or become fully alert, and checking the time is one of the things that tips a brief awakening into a long one.
The habit of checking is also very common, especially once your phone lives on the nightstand. It is not a character flaw. It is a reasonable response to uncertainty that happens to backfire at night.
What does this look like for new parents?
For new parents, some night waking is not optional, and there are real reasons to know the time: feeds, medication schedules, a baby’s age in hours for the first few days. That makes it worth separating useful time-keeping from anxious time-checking.
Research following mothers through the first months after birth found that total sleep time was often closer to normal than people expect, but that sleep was heavily fragmented (Montgomery-Downs and colleagues, American Journal of Obstetrics and Gynecology, 2010). Fragmentation is what makes the nights so draining, and the minutes after a feed are where a lot of extra wakefulness creeps in. If you settle the baby and then check the phone to see how long you have until the next feed, you have handed your brain a countdown at the exact moment it needs to let go.
Some practical swaps that keep the useful information without the countdown:
- Let an app or a partner log feeds, so you don’t need to see the time to remember it.
- Use a dim, warm night light rather than your phone screen during feeds.
- Put the phone face down or out of reach once the baby is settled, even if it has to stay in the room.
If your sleep stays broken even when the baby sleeps, postpartum insomnia goes deeper on that pattern, and how to get back to sleep walks through the minutes after a waking step by step.
What does this look like in perimenopause?
In perimenopause, the classic pattern is waking in the early hours, often with heat or a racing mind, and being unable to drop back off. Sleep difficulty becomes more common across the menopausal transition; in a large community survey from the Study of Women’s Health Across the Nation, Kravitz and colleagues (Menopause, 2003) found that reported sleep difficulty was more common in the later stages of the transition than before it began.
Those early-morning wakings are exactly when the clock does the most harm. Seeing 3:17 invites a whole story about the rest of the night and the day ahead, and that story is fuel for the alertness that is already rising toward morning. If you recognise this, why you wake at 3am explains the biology, and night sweats and sleep covers the heat side.
A gentle approach here: deal with the body first (throw off a layer, sip water, cool your face) without looking at the time, then rest as though it doesn’t matter what time it is. For the purpose of getting back to sleep, it really doesn’t.
How do I stop checking the time at night?
The most effective approach is to make the time hard to see, so the habit has nothing to land on.
- Turn the clock to face the wall or move it out of sight. Keep the alarm; lose the display.
- Charge your phone away from the bed. If it has to be close for a baby monitor or emergencies, put it face down and switch on a sleep focus mode so the screen stays quiet.
- Hide the time on a smartwatch with a sleep mode, or take the watch off at night if it tempts you.
- Use feelings, not minutes, as your guide. If you feel wide awake and frustrated, get up, sit somewhere dim and do something calm, and come back when you feel sleepy. This is stimulus control, one of the best-supported parts of treating insomnia without medication, and it works without a clock.
- Let the alarm do its job. The alarm will tell you when it is time to get up. Nothing else about the time is yours to manage in the night.
Expect a few nights of reaching for the clock out of habit. That’s fine. Each night you don’t check, the urge gets weaker.
Is checking sleep tracker data at night the same thing?
Very similar. Opening a sleep app at 2am to see how the night is going turns the night into a measurement, and measurements invite worry. In 2017, Baron and colleagues described patients in the Journal of Clinical Sleep Medicine whose concern with tracker numbers had become part of their sleep problem, and named the pattern orthosomnia: the pursuit of perfect sleep data. We wrote about the same effect in why sleep scores cause anxiety.
The data is genuinely useful, but its place is the morning, viewed as a trend across many nights rather than as a verdict on one.
The calm version
You don’t need to know the time to get back to sleep, and research suggests that knowing it makes sleep harder. Turn the clock away, keep the phone out of reach, and let the alarm be the only thing that tells you the hour. Mendtide reads your Apple Health sleep data and waits until morning to give you a calm briefing, so the night can just be the night.
The night doesn’t need to be measured while you’re in it. Let it be dark, let it be long, and let the morning tell you how it went.