It’s definitely not science but, for me, time seems to flow more uniformly at night. I have pretty bad ADHD so I big time struggle with “time blindness” - have I been working for 40 minutes or 4 hours? I guess when it’s the middle of the night I don’t really need to worry about how long it’s been. I only need to know that I don’t have to be anywhere else at the moment and my only hard stop is when I can’t keep my eyes open.