I often go several days without sleep. Then I might sleep for a few hours or for a whole day. I just 'go with the flow'.
For example, I went to bed early (2145) on Sunday but got up at 0330 on Monday. I laid on my bed for three hours on Monday evening (without really sleeping) but didn't go to bed properly until 0730 yesterday. I then slept until 2200, when I got up. So I've no idea whether I just be regarding the present time as late night Tuesday (meaning that I should go to bed again soon) or early morning on Wednesday (meaning that I might not go to bed until some time tomorrow).
If you've got nothing forcing you to be active at a certain time, just sleep when you feel like it!