It normal.
I am up working 27 hrs at a time and I sleep the next day or or the 2nd one after for 12-15hrs.
I am use to sleeping in the A.M. 9 to Noon as my work time is evenings. (28 yrs)
So I don’t make any appts. in the morning (other reasons too) because I get narcoleptic.
Go with the flow of your bodies clock. Dump the alarm on the days you don’t need to be somewhere.
Sleep is a good thing.
Recharges the brain.
Esp as you age and keep the long hours awake, like you posted.
Yeah, that’s what I do. I don’t set the alarm on Friday nights (my time to sleep). And I usually wake up around noon or later. During the week I would usually sleep around 5-6 hours. Maybe my body is just trying to get more sleep, to get rested. Sleep deprivation does build up. But it is an amazing experience.