People often report that they have not been asleep if they are awoken during stage ________ sleep
a. 1
b. 2
c. 3
d. 4
e. None of the above stages.
The answer is a. 1
Rationale:
1. Stage 1 is the mildest stage of NREM sleep. It usually determines by the occurrence of slow eye movements, this tired sleep stage can be easily interrupted which causes arousal or awakening. Muscle tone in the body relaxes and the activity if brain wave starts to slow down since awakening. Sometimes, people may undergo hypnic j e r k s or sudden muscle spasms and may even undergo a falling sensation when going in and out of Stage 1.
2. Stage 2 is the first real stage that is defined as NREM sleep. Arousals or awakenings do not happen as simply as in Stage 1 sleep and the slow-moving eye roll stops. Brain waves persist to decelerate with definite bursts of fast activity identified as a sleep spindle amalgamated with sleep structures identified as K complexes. Both the sleep spindle and K complex are supposed to function as safety for the brain from waking up from sleep. Body temperature starts to decrease and heart rate starts to slow down.
3. Stage 3 is identified as deep NREM sleep, the most uplifting sleep stage. Stage 3 comprises of slow waves or delta waves. Arousal or awakening is rare and it is usually difficult to wake a person in Stage 3 sleep. Parasomnias (sleepwalking, somniloquy or sleep talking and night terrors) happen in the deepest stage of sleep.
4. REM sleep, so-called quick eye movement, is best known as the dreaming stage. Eye movements are very fast, moving from one side to the other and brain waves are more active than in Stages 2 & 3 of sleep. Arousal and awakening can happen more easily in REM; awakening in the REM period can make a person feel dizzy or too sleepy.
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