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There are health conditions that cause a person to sleep far too much. If you frequently sleep too much, you may have a sleep disorder known as hypersomnia. There are several reasons why people sleep too much. Sleep apnea â this is a sleep disorder that causes people to stop breathing during sleep. The normal sleep pattern can be disturbed as many as hundreds of times a night. This amount of inadequate sleep leads to an increased sleepiness during the day as they are not getting enough quality sleep at night.
Causes: Narcolepsy: Unknown. The normal stages of sleep include a phase of rapid eye movement (REM). It is during the REM phase of sleep when we dream and during this time that our muscles become completely relaxed.