Stage N1
N1 is a state of light sleep. You can easily wake someone from this stage and they may be able to recall thoughts they were having or some images. N1 generally lasts for only the first few minutes of the sleep cycle. During N1, you may notice someone’s eyes rolling slowly under their lids. Muscles begin to relax in this stage and people often experience hypnic jerks (muscle twitches) and may feel like they are falling.
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