Anecdotal support incoming: I work out twice a day, 15-20 minutes of lifting in the morning and 15-20 minutes of exercise bike in the afternoon. Have done for a

Anecdotal support incoming: I work out twice a day, 15-20 minutes of lifting in the morning and 15-20 minutes of exercise bike in the afternoon. Have done for about the last 2 years. I also can't exercise after about 8 (I typically lay down for bed at midnight or so) or I'm up all night. I'm thinking that there might just be some sort of something in bodies where physical exertion induces a physical exertion mode to operate in that precludes sleep for a while. It kinda tracks in an evolutionary biology sort of way (despite that field being speculative an untestable): we didn't used to exercise. We used to exert ourselves when we needed to to stay alive and just sort of hang out and rest when we could get away with it. Having two modes, one that says "We're safe and comfortable and can lose consciousness for a few hours now" and another that says "Idk what we're doing but we're doing something and need to not fall asleep for a bit" has pretty obvious advantages compared to a system that allows you to take a nap in the middle of climbing a tree to avoid a predator.