... progression of NREM sleep to REM sleep occurs cyclically throughout the duration of a nights' sleep with a healthy individual entering REM sleep every 90 minutes up to a total of 4-5 times per night. It is also noteworthy that when combined, all of the REM stages of sleep contribute up to 25% of total sleep time whilst NREM represents roughly 50% (Carskadon & Dement, 2005 ... , such disturbances should become progressively worse as wakefulness continues and finally, the eventual cessation of deprivation should result in the individual experiencing an increase in sleep duration for the fo...

• Word Count: 3321
• Approx Pages: 13
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• Grade Level: Graduate