If you can’t sleep so you lay still for an extended period of time with your eyes closed, does that do anything to restore energy? Or does the fact you’re still awake make it a useless gesture?
In: Biology
The way I see it, the less energy you use up the more rested you feel. Let’s look at it from the other side and make the differences more extreme for comparison sake.
If you run a marathon, you become exhausted. So, would you still be as exhausted if you went for a walk in the park instead? A marathon uses much more energy than the park walk. Now, if instead of walking in the park we just sat on the couch, that would take up even less energy.
Sitting on the couch = sleeping
Walking in the park = resting but awake.
Marathon = Actively up and doing something in case it’s a “wasted gesture”
Anytime you’ve removed the need for rest, you put your body in the same state as resting would have. So conserving energy would be equivalent to resting.
Important to not, that just existing also uses up energy, so you do eventually need actual rest/sleep. You can’t sustain on only ever conserving the energy you have because some is always used up. Just less than a marathon does.
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