Morning and evening physical exercise differentially regulate the autonomic nervous system during nocturnal sleep in humans

Wishful

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https://journals.physiology.org/doi/full/10.1152/ajpregu.00127.2015

I came across this paper and thought it might be of interest to some people here. They found that the time of exercise affected sleep. I know that exertion after 2:30 PM gives me insomnia, so this paper might explain that.

The study involved significant physical exertion by healthy individuals, but that doesn't rule out the possibility that even minor exertion for ME victims might be enough to trigger such changes in sleep. Those of you suffering badly from unexplained sleep problems might consider looking for correlations with what you do during your days.

They should do a followup study using cognitive exertion.