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Sleepers are least responsive to outside stimulation during _____ sleep. (Points : 4)

stage 4
stage 3
stage 1
stage 2

1 Answer

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Sleepers are least responsive to outside stimulation during Stage 1 sleep. This is the stage in which the sleeper is experiencing the lightest form of sleep, where they're more sensitive to the outside world. 
User Parasrish
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