[evantbyrne]

I've noticed the same phenomenon myself. On days when I don't go to the gym or engage in some otherwise exhausting activity in the evening, I get much lighter sleep. It also fits my personal wacko hypothesis as to why so many retired old people have so much trouble sleeping, which I continue to recklessly propagate despite a complete lack of solid evidence: they just don't work hard enough.

[Modified3019]

That’s definitely an intriguing idea, and imo would be worth studying. (Then we could ignore the results and instead demand pills that don’t help or have pyrrhic side effects if they do.)