There was a while in college I was like that. It's like you confuse your circadian rhythm enough that it stops bothering you. It was super convenient, but once you sleep the several days in the row it starts breaking down. You just need to constantly be changing it up a bit.
My experience is the same. If I constantly change it up, I have no problems.
On weekends I try to hold to a more timezone specific schedule, but include odd naps at odd times to sort of keep the schedule of broken sleep.
One other aspect I've noticed is I used to feel more tired and people would always comment on how tired I looked. Now I feel much more awake and in the moment, although honestly I have no idea why this would matter.
I think I'm always kept at a constant state of having slept not all that long ago, even if it was a short period of time, and that helps? This is guessing.
The other aspect is, I try to keep my sleep intervals at an hour 30. so, 1:30, 3, 4:30 hours. Not sure if that has anything to do with it, but easier for me to wake up when I do that.
