What Is a Chronotype? Definition, the 4 Types and a Chart

By the ChronoSleep team · Updated October 23, 2026 · 6 min read

Chronotype definition

Your chronotype is the timing of your circadian rhythm, the roughly 24-hour internal clock that runs your sleep, alertness, body temperature and hormones. Researchers describe it on a spectrum from morningness to eveningness. Two questionnaires dominate the research:

• The Morningness–Eveningness Questionnaire (MEQ), published by Horne and Östberg in 1976, asks when you would naturally get up, go to bed and feel at your best.
• The Munich Chronotype Questionnaire (MCTQ), developed by Roenneberg and colleagues, measures chronotype as the midpoint of your sleep on free days, when no alarm or schedule is forcing your timing.

Chronotype isn't a box you either fit or don't. In large surveys using the MCTQ, sleep timing follows a smooth bell curve: most people are somewhere in the middle, with fewer extreme early and extreme late types at either end.

The four sleep chronotypes

The animal types were popularized by sleep specialist Dr. Michael Breus in The Power of When (2016). They turn the morning-to-evening spectrum into four easy-to-remember profiles, with one extra type for people whose main issue is light, broken sleep rather than timing:

• Lion: the early riser. Most alert in the morning and tired early in the evening.
• Bear: follows the sun. The most common type, with a mid-morning to early-afternoon peak and an afternoon dip.
• Wolf: the night owl. Slow mornings, with energy and creativity building through the afternoon and evening.
• Dolphin: the light sleeper. Sensitive to noise, light and stress, with fragmented sleep and focus that's sharpest mid-morning.

Chronotype chart

This chart shows the typical energy pattern of each chronotype across a day, ordered from earliest to latest. The curves are illustrative rather than measurements of any one person, but they show the main difference between the types: the same shape of day, shifted earlier or later.

Morning vs evening chronotypes

Evening chronotypes, or night owls, aren't lazy: their body clock runs later. Melatonin rises later at night, so they feel alert when early types are winding down, and early alarms cut into their sleep. The mismatch between your body clock and your work or school schedule is called social jetlag, and it tends to hit evening types hardest. If that's you, see how night owls can cope with a 9-to-5.

Age matters too. Children tend to be early types, teenagers get steadily later until around age 20, and people drift earlier again through adulthood. More on that in Can your chronotype change?

How to find your chronotype

1. Take a questionnaire. The free ChronoSleep quiz uses questions adapted from the MEQ and takes about 2 minutes, with no sign-up.
2. Watch your free-day sleep. During a holiday with no alarm, note when you naturally fall asleep and wake up. The midpoint between the two is how the MCTQ measures chronotype; the later it is, the later your chronotype.
3. Check your wearable. Some sleep trackers estimate chronotype from weeks of data. See how Oura's chronotypes work and how they compare to the four animal types.

Once you know your type, the most useful thing is usually timing: when to get daylight, when to do your hardest work, and when to start winding down. Each type's page has a free wind-down routine and the common mistakes to avoid.