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Humans’ first experience with yawning happens in utero, says Matthew D. Epstein, M.D., associate medical director of the Atlantic Health Sleep Centers in New Jersey.Yet, Earth-side, the somewhat ...
Snakes yawn, both to realign their jaws after a meal and for respiratory reasons, as their trachea can be seen to expand when they do this. Dogs, and occasionally cats, often yawn after seeing people yawn [11] [65] and when they feel uncertain. [66] Dogs demonstrate contagious yawning when exposed to human 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. [8] Yawning may be a cue that the body is tired and ready for sleep, but deliberate attempts to yawn may have the opposite effect of sleep induction.
A higher occurrence is reported in people with irregular sleep schedules. [4] When they are particularly frequent and severe, hypnic jerks have been reported as a cause of sleep-onset insomnia. [3] Hypnic jerks are common physiological phenomena. [5] Around 70% of people experience them at least once in their lives with 10% experiencing them daily.
As for how much sleep you got the night before or how stressed out you are, those are factors that could cause the brain to overheat, thus the necessity for a nice big yawn. As for the phenomenon ...
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Hori et al. regard sleep onset hypnagogia as a state distinct from both wakefulness and sleep with unique electrophysiological, behavioral and subjective characteristics, [10] [12] while Germaine et al. have demonstrated a resemblance between the EEG power spectra of spontaneously occurring hypnagogic images, on the one hand, and those of both ...
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