The official verdict is out on this one.
Theory 1 is routine. We get into a routine of waking and sleeping around the same time each day. Our body just rolls with it.
Theory 2 is environmental prompting we’re not entirely consciously aware of. Sounds and lights are cues we rely on heavily without realizing it.
Honestly I can see both. When I was working a 9-5, I had a fairly set routine of going to bed around 11 and waking around 7. Even on weekends I wanted to sleep in but for some reason I usually still woke up around 7 no matter when I went to sleep. Now that I’m not working my sleep has shifted a couple hours later but is still consistent.
The only time this changes is when my environment changes. When I’m backpacking I’m awake by 5 without setting an alarm. The forest is awake and the sun is awake so apparently it’s time for me to also be awake.
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