Normally, it takes people about 60 to 90 minutes to reach REM sleep, so they wouldnt enter this stage during a 20 minute nap. People with narcolepsy often enter REM sleep soon after falling asleep. If a person enters REM sleep in two or more of the five naps in eight minutes or less during the study, its highly suggestive of narcolepsy.
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About Julie Flygare, Wide Awake and Dreaming: A Memoir
Julie Flygare, Wide Awake and Dreaming: A Memoir.