why are we never aware of the exact moment we fall asleep?
In: Biology
Because what makes you sleepy is the production of the hormone melatonin, produced by the pineal gland in your brain. The level of melatonin fluctuates with the light your can see, regulating your circadian rhythms to coincide with the day/night cycle.
So, the effects of sleep aren’t like a signal through your nervous system, immediately triggering unconsciousness, they’re a gradual reaction to the rising melatonin levels in your bloodstream, resulting in drowsiness and eventually, unconsciousness.
The short answer is, you’re not conscious of becoming unconscious, because the very circumstances which make you alert prevent sleep.
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