Written by the Nuvirox Research Team
Key points
- In an experiment where people were instructed to monitor a clock while falling asleep, clock-watchers reported more pre-sleep worry and took longer to fall asleep.
- The effect held for good sleepers as well as poor ones, which suggests the behaviour creates the problem rather than merely accompanying it.
- Time-monitoring behaviour is measurable and tracks with insomnia severity, making it one of the few habits with a direct experimental case against it.
Short answer: yes, and unusually for sleep advice, this one was tested directly. Most bedtime rules are extrapolated from mechanism or observational data. Clock-watching is different: researchers assigned people to monitor a clock while trying to sleep and measured what happened. Worry rose and sleep onset lengthened, in good sleepers as well as in people with insomnia. The behaviour appears to be causal rather than incidental, and turning the clock away is one of the cheapest changes available.
What does checking the time actually do?
It converts an unpleasant but vague state into a precise problem with arithmetic attached. Lying awake feeling restless is uncomfortable. Knowing it is 3:14am and that your alarm goes at 6:30 turns that into a calculation about how much sleep remains, what tomorrow will cost, and whether the night is already ruined.
That calculation is a cognitive task, and cognitive tasks raise arousal. Arousal is precisely the thing that has to fall for sleep to arrive. So the check produces the opposite of what it was intended to achieve, and because you are still awake afterwards, it invites another check.
The loop is self-reinforcing in a specific way: each pass supplies fresh evidence that things are going badly. The interval between checks becomes data. Ten minutes of lying there is transformed from an unremarkable event into confirmation of a problem.
What human studies actually show
The key experiment assigned the behaviour rather than observing it. Tang, Schmidt and Harvey instructed thirty good sleepers and thirty poor sleepers either to monitor a clock or not to monitor one while trying to fall asleep, with worry measured by self-report and sleep measured by self-report and actigraphy. Compared with non-monitors, clock-monitors reported more pre-sleep worry and experienced longer sleep onset latency. Critically, this held true in both groups — the good sleepers were not immune.
Study snapshot
| Design | Experimental assignment to monitor or not monitor a clock |
| Participants | 30 good sleepers and 30 poor sleepers (Experiment 1) |
| Follow-up | 38 individuals with primary insomnia (Experiment 2) |
| Measures | Self-rated worry, self-reported sleep, actigraphy |
| Result | More pre-sleep worry and longer sleep onset in clock-monitors |
Time-monitoring behaviour can be quantified and relates to severity. Vochem and colleagues compared good sleepers with patients with insomnia using the Pre-Sleep Arousal Scale alongside a ten-item time-monitoring behaviour scale, and found that time monitoring was related to increased insomnia severity. Their more interesting observation was that the time-monitoring measure appeared more specific to insomnia than the general arousal scale, which did not itself correlate with the insomnia severity index.
A related experiment separated the clock from the display. Work using a modified attention paradigm found that a clock-monitoring task was rated as more worry-provoking and interfered with sleep more than monitoring a comparable digital display, and that participants who monitored the clock reported more pre-sleep worry and longer sleep onset than at their own baseline. The salience of time specifically, rather than the act of looking at something, seems to be doing the work.
The honest counterweight: these are small studies with self-reported worry as a central outcome. Sixty participants split across two conditions is not a large trial, actigraphy is a coarse measure of sleep onset compared with polysomnography, and asking people to monitor a clock and then asking whether they worried invites some demand characteristics. The direction of the finding is consistent and mechanistically sensible, but this is a modest literature rather than an overwhelming one.
Why misperception makes it worse
People with insomnia systematically overestimate how long they take to fall asleep and underestimate how much they slept. This is well documented, and it interacts badly with clock-watching. If your internal sense of elapsed time is already inflated by arousal, then checking the clock does not correct the error — it supplies an anchor for it.
The proposed explanation is that time feels longer under high arousal, and that heightened central nervous system activity blurs the boundary between light sleep and wakefulness, so periods of genuine sleep get remembered as time spent awake. The practical consequence is that the number on the clock is being interpreted through a distorted lens. It is not neutral information.
This is also why a sleep tracker reporting a bad night can make the following night worse. The mechanism is the same: a number that invites judgement about a process that does not respond well to being judged.
What turning the clock away won’t fix
It will not resolve insomnia. Removing the clock addresses one maintaining behaviour among several, and it is a single component of the broader behavioural approach that actually works. If you have been sleeping poorly for three months or more, on most nights, with consequences during the day, the useful step is a proper assessment and, where appropriate, cognitive behavioural therapy for insomnia.
It also will not help if what wakes you is physical. Breathing interruptions, pain, reflux, restless legs and needing to urinate repeatedly all have their own causes. See a doctor if your nights involve loud snoring, waking up gasping or choking, unrefreshing sleep despite adequate time in bed, or an uncomfortable urge to move your legs that worsens in the evening.
How to actually stop
Make checking physically inconvenient rather than relying on willpower. Turn the display to face the wall, move the phone out of arm’s reach, or put it in another room. Intention is a weak defence at 3am; distance is a strong one.
Keep an alarm, but make it one you cannot read. The reason people check is usually fear of oversleeping, and that fear is reasonable. A reliable alarm you cannot consult satisfies the underlying need without supplying the number.
Expect it to be uncomfortable for a week or two. Not knowing the time is unpleasant at first precisely because the checking was serving a function — it felt like control. What replaces it is a nightly experience of not knowing, which is genuinely better for sleep and genuinely worse for anxiety in the short term.
If you find yourself lying awake and agitated, the more effective move is to get out of bed rather than to lie there resisting the urge to check. Sitting somewhere dimly lit until you feel sleepy protects the association between your bed and sleep, and it is a better use of the time than shifting position repeatedly hoping something changes.
Where the checking is driven by a mind that will not settle in the first place, the clock is a symptom rather than the cause, and the rumination itself is the thing to address.
Frequently asked questions
What if I need to know the time for a genuine reason?
Then check once, deliberately, and reset. The problem is repeated monitoring, not a single glance. If you need to be up at an unusual hour, an alarm handles it better than periodic verification does.
Is looking at my phone worse than looking at a clock?
Almost certainly, because it adds light exposure and the possibility of engaging with content. But the experimental work suggests the time information alone is enough to raise worry and delay sleep onset, so a dim bedside clock is not a safe substitute.
I only check once or twice a night. Is that a problem?
It may not be. The studies looked at instructed monitoring rather than at a threshold number of glances. If a couple of checks do not trigger arithmetic and worry, they are probably benign. If they reliably start a spiral, frequency is beside the point.
Why does the time feel so much later than it turns out to be?
Time is perceived as longer under high arousal, and light sleep is often remembered as wakefulness. Both distortions push the same direction, which is why the clock so often reads earlier than expected.
Will a sunrise alarm or a sleep tracker help instead?
A sunrise alarm avoids the number, which is useful. A tracker reintroduces the problem in a different form, since a score inviting judgement about your sleep is the same kind of input as a clock face.
From Nuvirox
Why we formulated Sleep+ Restore
Reducing arousal before bed is the common thread in most of what helps. Sleep+ Restore is our evening formula, combining melatonin with a blend of botanicals and amino acids long used as part of a bedtime routine.
- 10 mg melatonin — melatonin is the most-studied sleep-timing compound in the supplement aisle; this is a high dose relative to the amounts used in most published trials, which is worth knowing before you start.
- 905 mg Sleep Formula blend — L-tryptophan, lycium, chamomile, lemon balm, passionflower, L-taurine, hops, St. John’s Wort, GABA, Chinese skullcap, L-theanine, ashwagandha, inositol and 5-HTP: botanicals and amino acids traditionally used in evening formulas.
- Vitamin B6, calcium and magnesium — cofactors included to round out the formula.
- 60-day money-back guarantee — long enough to actually evaluate it over a run of ordinary nights rather than one hopeful week.
The bottom line
Clock-watching is one of a small number of sleep habits with direct experimental evidence against it. When people were assigned to monitor a clock while falling asleep, they worried more and took longer to drop off, and the effect appeared in good sleepers as well as poor ones. The studies are small and rely partly on self-report, so the finding is consistent rather than conclusive. But the intervention costs nothing, the mechanism is coherent, and the interaction with sleep misperception gives a good reason to think the number you are looking at is not neutral information in the first place. Turn it around.
References
- Vochem J, et al. Pre-Sleep Arousal Scale (PSAS) and the Time Monitoring Behavior-10 scale (TMB-10) in good sleepers and patients with insomnia. Sleep Medicine. 2019. PMID: 30853192.
- Hilditch CJ, McHill AW. Sleep inertia: current insights. Nature and Science of Sleep. 2019;11:155–165. DOI: 10.2147/NSS.S188911.
- Kroese FM, Evers C, Adriaanse MA, De Ridder DTD. Bedtime procrastination: a self-regulation perspective on sleep insufficiency in the general population. Journal of Health Psychology. 2016;21(5):853–862. DOI: 10.1177/1359105314540014.
- Ferracioli-Oda E, Qawasmi A, Bloch MH. Meta-analysis: melatonin for the treatment of primary sleep disorders. PLoS ONE. 2013;8(5):e63773. PMID: 23691095.
*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. This article is for informational purposes only and is not a substitute for professional medical advice.