My Sim is waking up at 4 o’clock in the morning every day. I can send him back to sleep after that but it’s getting on my nerves anyways.
This bug is probably caused by the opening hours of some bars. If your Sims stays at those bars until closing, he can get this bug.
It’s actually not only sleeping that gets interrupted at 4 am but everything the Sim is doing at that moment.
Move your Sim out and back in and he’ll be cured.