How does our body wake up on it’s own from sleep without any external stimuli?
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Disclaimer that Sleep is still very much a field of research and exploration in terms of the why’s and how’s of its operation, there’s a lot we still don’t know about it.
In general, sleep is largely dictated by chemical and hormonal balances within your body. The feeling of “sleepy” (distinct from physical exhaustion) is triggered by the release of relevant hormones into your brain chemistry, and likewise when your systems determine that you’ve gotten enough sleep it will shift the balance to your wake-up state.
Also bear in mind that just because you don’t have an alarm clock going off or someone shaking you, doesn’t mean that there’s no stimuli. A common trigger for wake phase is an increase of light level, whether it be the true morning sun or something else simulating it.
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