What is the term for sleep periods of excessive depth or duration?

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Hypersomnia is a term used to describe excessive sleepiness during the day, along with prolonged periods of deep sleep at night. This can be caused by a variety of factors, including sleep disorders, medication side effects, and medical conditions such as depression or obesity. Cataplexy, sleep apnea, and sleep paralysis all refer to specific sleep-related phenomena, but do not necessarily involve periods of excessive depth or duration of sleep.

What Is the Term for Sleep Periods of Excessive Depth