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2. Hypnogram - Wikipedia

   en.wikipedia.org/wiki/Hypnogram

   Cycles of REM and non-REM stages make up sleep. A normal healthy adult requires 7–9 hours of sleep per night. The number of hours of sleep is variable, however the proportion of sleep spent in a particular stage remains mostly consistent; healthy adults normally spend 20–25% of their sleep in REM sleep. [5]

3. So THAT'S Why You Have Such a Hard Time Sleeping as You Get Older

   www.aol.com/thats-why-hard-time-sleeping...

   Sleep problems are especially common among older adults—20% of adults over age 65 experience sleeping problems compared to 14% of adults between the ages of 18 and 44.

4. Sleep onset latency - Wikipedia

   en.wikipedia.org/wiki/Sleep_onset_latency

   MSLT Scores Minutes Sleepiness 0–5: Severe 5–10: Troublesome 10–15: Manageable 15–20: Excellent A sleep onset latency of 0 to 5 minutes means severe sleep deprivation, 5 to 10 minutes is "troublesome", 10 to 15 minutes indicates a mild but "manageable" degree of sleep debt, and 15 to 20 minutes is indicative of "little or no" sleep debt.

5. Neuroscience of sleep - Wikipedia

   en.wikipedia.org/wiki/Neuroscience_of_sleep

   Sleep deprivation was also found to increase beliefs of being correct, especially if they were wrong. Another study reported that the performance on free recall of a list of nouns is significantly worse when sleep deprived (an average of 2.8 ± 2 words) compared to having a normal night of sleep (4.7 ± 4 words).

6. Rapid eye movement sleep - Wikipedia

   en.wikipedia.org/wiki/Rapid_eye_movement_sleep

   The relative amount of REM sleep varies considerably with age. A newborn baby spends more than 80% of total sleep time in REM. [54] REM sleep typically occupies 20–25% of total sleep in adult humans: about 90–120 minutes of a night's sleep. The first REM episode occurs about 70 minutes after falling asleep.

7. Sleep deprivation - Wikipedia

   en.wikipedia.org/wiki/Sleep_deprivation

   A well-rested and healthy individual will generally spend less time in the REM stage of sleep. Studies have shown an inverse relationship between time spent in the REM stage of sleep and subsequent wakefulness during waking hours. [24] Short-term insomnia can be induced by stress or when the body experiences changes in environment and regimen. [25]

8. AOL Mail

   mail.aol.com/?icid=aol.com-nav

   Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

9. Sleep cycle - Wikipedia

   en.wikipedia.org/wiki/Sleep_cycle

   The standard figure given for the average length of the sleep cycle in an adult man is 90 minutes. N1 (NREM stage 1) is when the person is drowsy or awake to falling asleep. Brain waves and muscle activity start to decrease at this stage. N2 is when the person experiences a light sleep. Eye movement has stopped by this time.