throwaway901617 t1_izr8sw7 wrote
Reply to comment by Practice_NO_with_me in Molecular markers of cells involved in the sixth sense — proprioception, the unconscious sense of body position and movement by marketrent
Your body "knows when it needs to be awake" because you've routinely woken at that time and programmed your internal biological clock to wake at that time.
It detects changes in temperature, air pressure etc that occur at that time. That's how it is triggered.
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