In answer to the person who asked what people do. My son goes to bed at 7. I then have to sort the bathroom, tidy his toys, do myself something to eat, and finish sorting the kitchen out. I then sit and watch some tv.
My husband often starts work between 9-11am and doesn't get home until 11.30pm, often later. This is because of his job. If I went to bed we would hardly see each other. So I stay up, he comes home, has a shower and we sit down, have a few drinks and watch telly. We go to bed early hours of the morning. I'm usually awake around 6, sometimes earlier, lying in bed waiting for ds to wake up. Dh gets up when he has to for work.
So that's what I do when I'm up so late, I wait up for my husband who I usually haven't seen all day, and won't see all the day after. It's often the only time we have together.