Also, REM sleep was slightly lower during the second night compared with the first night in the control group, however, this did not reach statistical significance and may have reflected spontaneous day to day variation, especially since the overall amount of REM sleep is very low and a few epochs of REM sleep already make a difference.
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The European starling (Sturnus vulgaris) shows signs of NREM sleep homeostasis but has very little REM sleep and no REM sleep homeostasis.
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