Updated 22 October 2026
What is a chronotype?
Your chronotype is the timing your body clock prefers for sleep: early birds naturally sleep and wake early, night owls late, and most people sit somewhere in between.
Everyone has an internal clock that runs on a roughly 24-hour cycle. Daylight resets it each day, but people differ in how their clock lines up with the sun. Some feel sleepy soon after dark and wake bright at dawn. Others only feel tired well after midnight and struggle to get going in the morning, even after a full night.
Researchers measure this with the midpoint of your sleep on free days, when no alarm or schedule pushes you around. If you fall asleep at midnight and wake at 8:00, your mid-sleep is 4:00. The later that midpoint, the later your chronotype. In large surveys with the Munich ChronoType Questionnaire, chronotypes spread out smoothly from very early to very late, rather than falling into a few neat boxes.
A chronotype is not a habit you chose or a sign of laziness or discipline. It is shaped by your genes, your age and how much daylight you get, and it says nothing about how well you sleep. A night owl who gets enough sleep at the right time for them can sleep as well as anyone.
How this quiz works
This quiz uses the mid-sleep method of the Munich ChronoType Questionnaire (MCTQ), published by Roenneberg and colleagues in 2003: it takes the halfway point of your sleep on free days and corrects it for sleep you're catching up on.
- Sleep on each kind of day. From your times we work out how long you sleep on work days and on free days, and the midpoint of each.
- Your weekly average. We weight the two by how many work and free days you have: average sleep = (work-day sleep × work days + free-day sleep × free days) ÷ 7.
- The correction. If you sleep longer on free days than on work days, part of that lie-in is paying back sleep debt, which makes you look later than you are. So we move your free-day midpoint earlier by half the gap between your free-day sleep and your weekly average. This is the corrected value researchers call MSFsc.
- Your type. We group the corrected midpoint: before 3:00 is an early bird, 3:00 to 4:59 is in between, and 5:00 or later is a night owl. These cut-offs are our own simple grouping to make the number easier to read; the research treats chronotype as a scale, not as types.
Times after midnight are handled for you: falling asleep at 00:30 counts as the same night as going to bed at 23:00. If an alarm wakes you on free days, the result is less reliable, because your free-day sleep is no longer free. The quiz tells you when that's the case.
The three chronotype groups in this quiz
The quiz sorts your corrected mid-sleep time into three groups: early bird (before 3:00), in between (3:00 to 4:59) and night owl (5:00 or later).
| Group | Mid-sleep | Example free-day sleep | What it typically means |
|---|---|---|---|
| Early bird | Before 3:00 | 22:30 to 6:30 | Sleepy early in the evening, awake early without trying. Early starts are easy; late nights cost you. |
| In between | 3:00 to 4:59 | 23:30 to 7:30 | Fits most work and school hours reasonably well. Can drift later with late screens and little daylight. |
| Night owl | 5:00 or later | 1:00 to 9:00 | Alert late in the evening, slow in the morning. Early alarms often cut sleep short on work days. |
What is social jetlag?
Social jetlag is the gap between the midpoint of your sleep on work days and on free days; a gap of 2 hours feels a little like flying two time zones west every weekend and back every Monday.
The term comes from Wittmann, Dinich, Merrow and Roenneberg, who described in 2006 how work and school schedules pull many people away from the timing their body clock prefers. On work days the alarm sets your wake time; on free days your clock does. The bigger the difference, the more your week swings between two schedules.
Night owls tend to have the most social jetlag, because standard morning start times fall in what is still their biological night. They go to bed late because they aren't sleepy earlier, get woken early by the alarm, run short on sleep through the week and then sleep in on the weekend. Early birds can have it the other way around if their social life keeps them up late on free days.
A small gap is normal. If yours is large, the most useful changes are keeping your free-day wake time close to your work-day one and getting daylight soon after you wake, which helps your clock settle on one schedule instead of two.
Can you change your chronotype?
You can nudge your sleep timing earlier or later with light and a steady routine, but you can't rewrite your chronotype; it also shifts by itself with age, getting later through the teens and earlier again from around 20.
That age pattern comes from a large MCTQ study by Roenneberg and colleagues in 2004, which found chronotype gets later through adolescence, reaches its latest point around the age of 20 and then slowly becomes earlier again through adult life. It's one reason teenagers find early school starts so hard.
Light is the main signal your clock uses. Bright light in the morning pulls it earlier; bright light and screens late in the evening push it later. People who spend most of the day indoors under dim light tend to drift later. So if you're a night owl who wants to fall asleep a bit earlier, the practical levers are:
- get outside in daylight within an hour or so of waking;
- dim lights and screens in the last hour before bed;
- move your bedtime earlier in small steps, around 15 minutes every few days, rather than all at once;
- keep your wake time steady, free days included.
These shift your timing within the range your clock allows. A strong night owl won't become a 5 a.m. riser, and doesn't need to. If you're very sleepy in the day, can't sleep at any time you choose or your sleep worries you, talk to a doctor.
Questions
Is this chronotype quiz accurate?
It's as accurate as the times you enter. It uses the same mid-sleep calculation as the Munich ChronoType Questionnaire, a widely used research questionnaire, but it is a short self-check, not a sleep study. Answer with your usual times over the last few weeks, not one unusual night.
Does the quiz save or send my answers?
No. The calculation runs in your browser. Nothing you enter is sent to us or stored, and the result disappears when you close the page.
I work night shifts. Can I use this quiz?
Not reliably. The method assumes you sleep at night on both work and free days. Rotating or night shifts move your sleep for reasons that have nothing to do with your chronotype, so the result would be misleading.
Sources
- Roenneberg T, Wirz-Justice A, Merrow M. Life between clocks: daily temporal patterns of human chronotypes. J Biol Rhythms. 2003;18(1):80–90.
- Roenneberg T, Kuehnle T, Pramstaller PP, et al. A marker for the end of adolescence. Curr Biol. 2004;14(24):R1038–9.
- Wittmann M, Dinich J, Merrow M, Roenneberg T. Social jetlag: misalignment of biological and social time. Chronobiol Int. 2006;23(1–2):497–509.
- Roenneberg T, Pilz LK, Zerbini G, Winnebeck EC. Chronotype and social jetlag: a (self-) critical review. Biology (Basel). 2019;8(3):54.