Overexertion always causes trouble falling asleep.
Same for me. Overexertion always leads to worse sleep. Resting for a few days makes my sleep better (not great, but better).
But I didn't vote because the poll is about falling asleep. I never have trouble falling asleep at night.
[ Well, almost never. Very rarely something will keep me up but the last time that happened was more than 2 years ago. ]
My problem is
staying asleep.
I wake up many times during the night for no apparent reason. I don't wake up because I'm hot/cold, or having a nightmare, or anything like that. I'm just awake.
And I never lie awake worrying (that's something my husband often does). I'm always able to go back to sleep very quickly (less than 5 minutes).
On a good night, I only wake up 4-5 times. On a bad night I wake up 12-14 times. That means I'm sleeping in short bursts that range from 20-30 minutes. And for all I know I also wake up more often and I'm just not conscious of waking up. These are just the times when I know I'm awake.
Some years ago I did a home sleep test to check for apnea. I did not have any apnea. It's not just that I was below some threshold number of apnea events per hour. I had zero apnea events. And my blood oxygen (measured by a thing attached to my finger, forgot the name) was also fine (98%).
I never did a full sleep study because the doctor (sleep specialist) was pretty much fixated on the apnea thing. She knew nothing about autonomic issues and I think these are related to my sleep problems (I could be wrong). Anyway, I didn't have much faith in her ability to help me. So I gave up.