What is a Chronotype? | AYO Glossary of Sleep Terms

Hello Summer!
Save 15% on your entire purchase for a limited time only! Enter code SUMMER at checkout.

Circadian Health Glossary

What Is a Chronotype?

The chronotype is the body's predisposed preference for sleeping and waking times. It is influenced largely by genetic components but also shaped by environmental factors and age. Our chronotypes act as the center of the circadian rhythm. This internal clock influences everything from hormone production to how well we think throughout the day. Understanding one's chronotype is like learning the body's preferred sleep schedule. By knowing it, we can manage our energy levels more effectively.

What Determines a Chronotype?

Chronotypes are not chosen; they’re inherited. However, external factors play significant roles, too. Light exposure is perhaps the most substantial influencer of our internal body clocks. The light from our electronic devices, artificial indoor lighting, and the natural rays of sunrise alert our bodies to start the day, while melatonin release in the evening signals it’s time to wind down.

Common Chronotypes

Traditionally, chronotypes have been categorized into four primary types: the lion, the bear, the wolf, and the dolphin. Each type has unique characteristics and optimal times for productivity and rest.


They tend to wake up early with lots of energy and are most productive in the morning. They might start to lose energy in the late afternoon and prefer to go to bed early.


They align closely with the solar cycle and have ups and downs in their energy throughout the day. They are most productive before noon and in the early evening, often needing a mid-afternoon nap to recharge.


These individuals are the night owls. They struggle with morning alertness but hit their peak energy levels in the late afternoon and evening.


They are often light sleepers and prone to insomnia. This type has unpredictable energy levels, with their most alert periods usually occurring in the late morning and late evening.

Understanding these chronotypes can help individuals tailor their daily routines, from work to social activities, to match their internal clocks, potentially improving overall well-being and productivity.

Circadian Rhythm vs. Chronotypes

While both circadian rhythms and chronotypes are geared towards regulating sleep-wake patterns, they are distinctly different concepts. Circadian rhythms are biological processes that cycle roughly every 24 hours, controlling not only sleep but also various physiological functions. These rhythms are largely influenced by external cues, primarily light and darkness, which signal the body to feel awake or sleepy.


On the other hand, a chronotype is more about personal preference and inclination towards certain times of the day for sleeping and activity. Essentially, circadian rhythms dictate the body’s natural inclination towards a sleep-wake cycle, whereas chronotypes are how individuals adapt their schedules within the framework of these rhythms to maximize productivity and well-being.

Shopping Cart