My experience is very similar. When I was young, I could stay up for 26 - 30 hours regularly without any issues, even on multiple consecutive days. I would be

My experience is very similar. When I was young, I could stay up for 26 - 30 hours regularly without any issues, even on multiple consecutive days. I would be fine no matter how I slept. No more. If my sleep schedule gets disrupted in any way, too short or too long, my body will immediately go into "things are not right" mode.