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If my own anecdotal experience says anything, I can easily slash two to three hours of sleep, when I run four to five miles in the morning.

During snowy winter weeks I am mostly sedentary, I need eight to nine hours to feel refreshed, and I need coffee to stay awake after lunch.

When weather is good and I run four to five miles in the morning everyday, I only need to sleep from midnight to 6 AM. I wake up at that time automatically without alarm.

I feel 40 minutes of running can equal two hours of extra sleep. Perhaps running increases blood flow and also helps clean up trashes in the brain, as what people claim sleeping does to your brain.

And yes, I feel so happy after running.




Note that "During snowy winter weeks" it's also the darkest part of the year, which also has a known correlation to (un)happiness.

So it may be "just" the light or it could be both your lifestyle change and the lack of light siphoning happiness.




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