Morning person or night owl? Your sleep preferences
CareOps editorial team · · Updated · 5 min read
Mental wellness information and service guidance published by CareOps.
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Read our full editorial standards →For some, mornings are a struggle even with five alarms; others become sleepy at 10 p.m. This is often described as a difference in diligence, but research points to differently timed body clocks.
At a glance
- Chronotype reflects body-clock differences shaped by genes, age, and light. It is not a measure of laziness or diligence.
- For night owls, a major difficulty is social jetlag: the mismatch between the body clock and society's timetable, rather than late sleep alone.
- A complete reversal may be difficult, but timing can shift. In one study, night owls adjusted morning light, waking, and meal times for three weeks, advancing sleep onset by about two hours.
How morning and evening preferences differ
| Morning preference | Evening preference | |
|---|---|---|
| When sleepiness begins | Early evening | Around midnight or later |
| Most alert time | Morning | Late afternoon through evening |
| On days without an alarm | May naturally wake earlier | May naturally wake later |
| Difficult schedules | Evening events and late work | Early starts and morning meetings |
This preference for earlier or later daily timing is called chronotype. The table shows broad tendencies, not fixed bedtime categories. Most people fall between the two ends, and work schedules or missed sleep can change what you observe.
Why chronotypes differ
Genes
A study of nearly 700,000 people's genetic data (Jones et al., 2019) identified 351 genetic regions associated with morning or evening preference, including genes involved in light sensing and the body clock. Timing is partly biological before willpower enters the picture.
Age
A study of 25,000 people (Roenneberg et al., 2004) found that timing becomes later through adolescence, reaches its latest point around age 20, and then gradually shifts earlier. Difficulty with mornings in adolescence and early adulthood can reflect development rather than attitude.
Light
In an experiment involving a week of camping without electric lights or screens (Wright et al., 2013), participants' body clocks shifted about two hours earlier, with larger changes in those who were usually night owls. Evening artificial light can push our clocks later.
Why night owls feel tired: social jetlag
A night owl may not feel sleepy until 1 a.m., yet the alarm rings at 7 a.m. Short weekday sleep leads to sleeping in on days off. This mismatch is called social jetlag (Wittmann et al., 2006), like flying west every Friday and returning on Monday.
In that study of 501 people, evening preference was associated with more smoking. The researchers looked to social jetlag as an explanation rather than evening preference alone. Much of the difficulty comes from living on a timetable designed for morning people.
Shifting earlier: a three-week study
A small study of 22 strong night owls tested a three-week routine involving sleep, light, meals and exercise (Facer-Childs et al., 2019). The list below describes that study’s protocol; it is not a schedule every reader needs to follow.
- Wake two to three hours earlier than usual and get plenty of outdoor morning light.
- Go to bed two to three hours earlier and reduce evening light.
- Keep bedtime and waking within 15–30 minutes across workdays and days off.
- Eat breakfast soon after waking, lunch at a consistent time, and dinner before 7 p.m.
- Avoid caffeine after 3 p.m. and naps after 4 p.m.
- Exercise in the morning.
After three weeks, sleep and waking shifted about two hours earlier without reducing sleep duration. Depression and stress scores decreased, while morning reaction time and muscle strength improved.
If you need an earlier schedule, aim for a routine you can sustain while protecting enough sleep. Avoid abruptly moving your alarm hours earlier while your bedtime stays unchanged. A clinician can help when your sleep timing repeatedly conflicts with work or school.
Living well with an evening preference
You do not have to become a morning person. If changing your rhythm is difficult, adapting your schedule to it is another option.
- Put important work at your most alert time. Move demanding tasks to the afternoon or evening.
- Keep a reasonably consistent routine. Large weekday–weekend shifts can make the next transition harder. If you regularly need to catch up, review whether your weekday schedule allows enough sleep.
- Use mornings for lighter tasks. Schedule replies or organizing that require less judgment.
- Choose a later start if possible. Flexible working hours can be particularly helpful.
- Make room for daylight after waking. Light helps set the body clock. The useful timing depends on your current rhythm; a fixed five-minute dose is not a universal prescription.
When sleep timing disrupts daily life
If you cannot sleep until 3 or 4 a.m. and cannot wake in time for school or work, a sleep-timing problem may be involved. Consult a sleep clinic or mental health professional. If racing thoughts keep you awake, see this guide.
Am I a morning person or a night owl?
The five-item reduced Morningness-Eveningness Questionnaire (rMEQ) explores your preferred daily rhythm. It is a short form of a widely used research questionnaire. You can try it in about a minute without signing in.
Try a self-assessment without signing inrMEQ · Morning or evening preferenceExplore when you tend to feel most alertStart the check →Frequently asked questions
- Is an evening preference worse for health?
- A large genetic study associated morning preference with better mental health. Researchers also point to insufficient and irregular sleep from mismatched social schedules, rather than evening preference alone. Sleep duration and consistency matter.
- Are morning people more successful?
- Evidence for that claim is weak. School and work schedules favor morning preferences; night owls can perform well at times that suit their rhythm.
- Do we become morning people as we age?
- On average, timing is latest around age 20 and gradually moves earlier afterward.
- Does sleeping in on weekends make up for weekday sleep loss?
- Extra sleep may ease some immediate tiredness, but it is worth addressing repeated short sleep during the week. Aim for adequate sleep and a manageable routine rather than treating weekend catch-up as the whole solution. Avoid driving when sleepy.
Sources
- Adan & Almirall (1991), Horne & Östberg morningness-eveningness questionnaire: A reduced scale, Personality and Individual Differences
- Jones et al. (2019), Genome-wide association analyses of chronotype in 697,828 individuals provides insights into circadian rhythms, Nature Communications
- Roenneberg et al. (2004), A marker for the end of adolescence, Current Biology
- Wright et al. (2013), Entrainment of the Human Circadian Clock to the Natural Light-Dark Cycle, Current Biology
- Wittmann et al. (2006), Social Jetlag: Misalignment of Biological and Social Time, Chronobiology International
- Facer-Childs et al. (2019), Resetting the late timing of 'night owls' has a positive impact on mental health and performance, Sleep Medicine
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