Yes, within limits: in a 2019 study, 22 self-described night owls who fixed their wake time, got morning light and cut evening light shifted their sleep timing about two hours earlier in three weeks, and reported feeling less depressed and less sleepy in the mornings. Light is the strongest signal the body clock has, and morning light pulls it earlier. A lamp can supply that signal on dark UK mornings, but it works with a fixed schedule, not instead of one.
What is a night owl, biologically?
Everyone's internal clock runs slightly differently. A late chronotype, the research term for a night owl, is someone whose clock is set later than average: naturally alert late into the evening, hard to wake early, most tired around the time the rest of the household is getting up. It is partly genetic, changes with age (teenagers run late, older adults run early) and is not a character flaw. The trouble is that work, school and the UK winter are all timed for larks.
In winter the mismatch gets worse. The morning light that would pull a late clock earlier arrives after 8 am across much of the country in December and January, so a night owl who wakes at 7 am in the dark is getting no morning signal at all, and the bright screens and lamps of the evening are pushing the clock later still.
What did the night owl study actually do?
Facer-Childs and colleagues at the universities of Birmingham and Surrey, with Monash University, recruited 22 healthy adults whose average bedtime was around 2.30 am and average wake time around 10.15 am. For three weeks, half followed a set of instructions and half carried on as normal. The instructions were ordinary and specific:
- Wake two to three hours earlier than usual and get as much outdoor light as possible in the morning.
- Go to bed two to three hours earlier and limit light in the evening.
- Keep the same sleep and wake times on work days and free days.
- Eat breakfast soon after waking, lunch at the same time each day, and no dinner after 7 pm.
The group that followed the routine advanced their sleep and wake timing by about two hours, measured by wrist activity monitors and by the timing of melatonin and cortisol, the body's own clock markers. They reported lower depression and stress scores, less sleepiness in the morning, and did better on tests of reaction time and physical performance in the mornings. The paper was published in Sleep Medicine in 2019.
Two honest caveats. It was small, 22 people, and it lasted three weeks. And the light in the study was outdoor daylight, not a lamp. What it shows is that the timing of light and sleep can move a late clock; a lamp is one way of getting bright morning light when the sky cannot provide it.
Where does a lamp fit in?
The Birmingham study relied on outdoor morning light, which in Britain is only available for part of the year. In December, a night owl waking at 7 am in Manchester is an hour and a half ahead of sunrise. A bright lamp at breakfast fills that gap: 10,000 lux at the rated distance for 20 to 30 minutes is the protocol used in seasonal affective disorder research, and the same morning light shifts the clock earlier in anyone. The best time of day to use a light therapy lamp explains why the first hour after waking is the window that matters, and how far to sit covers the distance.
The lamp does not do the job on its own. The study's other three rules, a fixed wake time seven days a week, dimmer evenings and regular meals, are what stop the clock drifting back. Weekend lie-ins undo the work quickly, which weekend lie-ins and social jet lag explains.
What should you expect?
A gradual shift, not a switch. Body clocks move by something like an hour a day at most, and in practice most people find it takes one to two weeks of consistent mornings before the earlier alarm stops feeling like an assault. The trap is the second weekend: two late nights and two lie-ins can put the clock back where it started.
| Habit | Why it matters for a late clock |
|---|---|
| Bright light within an hour of waking | Pulls the clock earlier; the main lever |
| Same wake time seven days a week | Stops the clock drifting back at weekends |
| Dim, warm light after about 8 pm | Evening light pushes the clock later |
| Regular meal times, no late dinner | Meal timing is a secondary time cue |
| No lamp sessions in the evening | Bright light late in the day works against you |
Frequently asked questions
Is being a night owl a medical problem?
Usually not. Where the pattern is extreme and causes real difficulty with work or school, there is a recognised sleep condition called delayed sleep phase disorder, and a GP can refer you for advice. If you are managing but tired, the habits above are where most people start.
Can a lamp shift my clock if I still go to bed at 2 am?
It can pull the morning earlier, but you will be short of sleep, which brings its own problems. The study moved both ends of the night together. Short sleep is not a price worth paying for an earlier wake time.
Should teenagers use a SAD lamp for school mornings?
Teenagers' clocks run late as a matter of biology. Bright morning light is one of the standard suggestions for school-day mornings, but this article is about adults, and for anyone under 18, or anyone with an eye condition or a condition affected by bright light, the sensible route is a conversation with a GP first.
What about the clocks going back?
The October change gives night owls a one-off hour in their favour and a darker evening in exchange. When do the clocks go back in 2026? explains how to use it.
Where does this leave you?
A late body clock can be moved, and morning light is the main lever. In a British winter that light has to come from somewhere other than the sky before 8 am, which is where a lamp earns its place, alongside a fixed wake time and dimmer evenings. Expect a couple of weeks of effort and guard the weekends. How to build a morning routine around a light therapy lamp turns this into a plan, and the choose your light page compares DAYARC Rise and Mini.
About DAYARC
DAYARC is a new UK circadian rhythm startup. We make two bright-light lamps for the morning: DAYARC Rise (£199), a full-size lamp rated at 10,000 lux at approximately 30–36 cm, with four brightness settings, a 15 to 60-minute timer and adjustable height and angle; and DAYARC Mini (£49.99), a compact lamp rated at 10,000 lux at approximately 25 cm, with a folding stand that doubles as its cover. Both use UV-free LEDs and run from the mains. We publish plain specifications with the measuring distance, we do not make medical claims, and we write the DAYARC Journal to help people build a simple morning light routine around their own daily rhythm. You can read more about how we think on our approach page or compare the two lamps.
This article is general information, not medical advice. Check with a GP or qualified healthcare professional before using bright light if you have an eye condition, a condition affected by bright light such as bipolar disorder, or take medicines that increase your sensitivity to light. If you have persistent low mood or think you may have depression, speak to your GP. If you need urgent help, contact NHS 111, or call 999 in an emergency.
Sources
- Facer-Childs E. R., Middleton B., Skene D. J. and Bagshaw A. P. (2019). Resetting the late timing of "night owls" has a positive impact on mental health and performance. Sleep Medicine, 60, 236–247
- University of Birmingham (2019): Night owls can retrain their body clocks to improve mental well-being and performance
- NHS: Insomnia (sleep habits advice)
- NHS: Seasonal affective disorder (SAD)