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[9]: 109 Clodoré et al. found differences in alertness between morning and evening types after a two-hour sleep reduction. [21] Duffy et al. investigated "changes in the phase relationship between endogenous circadian rhythms and the sleep-wake cycle", and found that although evening types woke at a later clock hour than morning types, morning ...
A Young Man Reading by Candlelight, Matthias Stom (ca. 1630). A night owl, evening person, or simply owl, is a person who tends or prefers to be active late at night and into the early morning, and to sleep and wake up later than is considered normal; night owls often work or engage in recreational activities late into the night (in some cases, until around dawn), and sleep until relatively ...
A study in 2009 examined differences between evening and morning types in the timing of melatonin and core body temperature rhythms as well as objective and subjective sleepiness rhythms in a controlled laboratory protocol. The evening types had significantly later timed rhythms for all these variables, particularly that of maximum alertness ...
According to the National Sleep Foundation, adults should be getting between seven and nine hours of sleep each night. OK, that’s a great goal, but getting less than seven hours every now and ...
Participants in a small study slept an average of 27.7 minutes longer when they took regular exercise breaks in the evening over a four-hour period compared with when they sat uninterrupted.
There's a theory that states that waking at a certain time of night is actually a signal from your body about something going on inside. As you sleep, your body undergoes many states of activity.
People with DSPD fall asleep at more or less the same time every night, and sleep comes quite rapidly if the person goes to bed near the time they usually fall asleep. Young children with DSPD resist going to bed before they are sleepy, but the bedtime struggles disappear if they are allowed to stay up until the time they usually fall asleep.
However, for a sleep phase delayed person, the time of biological morning and biological afternoon/evening might differ depending on the circadian clock shift in the affected person. This means that if melatonin is taken during the usual bedtime and wake-up time (i.e., usual nighttime), it may have no effect.