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Polyphasic sleep, a term coined by early 20th century psychologist J.S. Szymanski,[1] 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.
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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.