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Polyphasic sleep, a term coined by early 20th century psychologist J.S. Szymanski, refers to the practice of sleeping multiple times in a 24-hour period—usually more than two, in contrast to biphasic sleep—and does not imply any particular sleep schedule. The circadian rhythm disorder known as irregular sleep-wake pattern is an example. The term polyphasic sleep is also used by an online community which experiments with ultra-short napping to achieve more time awake each day.
This is why some teenagers go bad in school grades, they are forced too early for those with nocturnal clocks and are half asleep during class.