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Polyphasic sleep is the practice of sleeping during multiple periods over the course of 24 hours, in contrast to monophasic sleep, which is one period of sleep within 24 hours. Biphasic (or diphasic, bifurcated, or bimodal) sleep refers to two periods, while polyphasic usually means more than two. [1] Segmented sleep and divided sleep may refer ...
There are two main characteristics of narcolepsy: excessive daytime sleepiness and abnormal REM sleep. [15] Excessive daytime sleepiness occurs even after adequate night time sleep. A person with narcolepsy is likely to become drowsy or fall asleep, often at inappropriate or undesired times and places, or just be very tired throughout the day.
An oil painting of a young woman having a siesta, or an afternoon nap, which usually occurs after the mid-day meal. Postprandial somnolence (colloquially known as food coma, after-dinner dip, or "the itis") is a normal state of drowsiness or lassitude following a meal. Postprandial somnolence has two components: a general state of low energy ...
Springtime lethargy. Springtime lethargy is the state of fatigue, lowered energy, or depression associated with the onset of spring. Such a state may be caused by a normal reaction to warmer temperatures, or it may have a medical basis, such as allergies or reverse seasonal affective disorder. [1] In many regions, there is a springtime peak in ...
Toddlers (1–2 years): 11–14 hours, including naps Young children (3–5 years): 10–13 hours, including naps School-age children (6–12 years): 9–12 hours
Hypnagogia is the transitional state from wakefulness to sleep, also defined as the waning state of consciousness during the onset of sleep. Its opposite state is described as hypnopompia – the transitional state from sleep into wakefulness. Mental phenomena that may occur during this "threshold consciousness" phase include hypnagogic ...
Chronic partial sleep deprivation is a form of sleep deprivation caused when one obtains some but inadequate sleep. Acute sleep deprivation is more widely known as the scenario in which one is awake for 24 hours or longer. [8] From student reports, 70.65% of students are sleep deprived and 50% of college students exhibit daytime sleepiness.
Microsleep. A microsleep is a sudden temporary episode of sleep or drowsiness which may last for a few seconds where an individual fails to respond to some arbitrary sensory input and becomes unconscious. [1][2] Episodes of microsleep occur when an individual loses and regains awareness after a brief lapse in consciousness, often without ...