is often a time of increased relaxation, attributed to the release of the neurohormones oxytocin and prolactin.

Yawning

Yawning is commonly associated with imminent sleep, but it seems to be a measure to maintain arousal when sleepy and so it actually prevents sleep rather than inducing it. Yawning may be a cue that the body is tired and ready for sleep, but deliberate attempts to yawn may have

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