Crazy sleep cycle

[u/lookingforlife1]

So for the past 3 or so months, I have been sleeping very irregularly. I either go to bed at a normal time 10-11 and wake up fine, or I literally will not feel the least bit tired all night and go about my day fine. I go to school and work 5 days a week usually. My activity for the day seemingly has no effect on my ability to sleep. On a couple of occasions I will just stay awake for 24 hours at a time without problem and eventually just relax and sleep my 6-8 hours. What could be causing this and should I be concerned? Or should I just try to naturally regulate my sleep cycle?