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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.
Merely thinking about or seeing someone yawning can make you yawn. But why?
Most people yawn because they’re tired, but it can also happen unexpectedly and without any triggers. While yawning is typically harmless and only lasts about five to 10 seconds, when it occurs ...
In order to take a closer look, researchers monitored 36 participants as they watched other people yawn. Turns out it comes down to each person’s excitability.
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.
A 2010 review of published scientific research suggested that exercise generally improves sleep for most people, and helps sleep disorders such as insomnia. The optimum time to exercise may be 4 to 8 hours before bedtime, though exercise at any time of day is beneficial, with the exception of heavy exercise taken shortly before bedtime, which ...
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One of the important questions in sleep research is clearly defining the sleep state. This problem arises because sleep was traditionally defined as a state of consciousness and not as a physiological state, [14] [15] thus there was no clear definition of what minimum set of events constitute sleep and distinguish it from other states of partial or no consciousness.