Sleep schedule

[Froge]

Every night, I have scheduled entertainment time from 9 pm - 1 AM. This is because I have a lot of work to get done during the day and thus my scheduled entertainment time is like my motivation for getting through all of it.

Lately, however, I've been experiencing this strange sleeping problem. About midway through my scheduled entertainment, I will become really, really sleepy, and at the very end (at 1 AM) I become wide awake. However, I don't actually go to sleep before 1, even if I'm really tired, because if I don't complete those 4 hours of entertainment I will feel as if I haven't reaped the rewards of my daytime work. I'm also sort of OCD so I like sticking to schedule.

Any thoughts and / or tips?