Going to bed... me

So, I went to bed around 11... AGAIN. I know I should be going to bed at 10. My body needs sleep... but I can't make myself. Is anyone else in this boat?

The twins go down around 7:30 or 8. Then, dh is either out training or we watch a show together. Around 9:30-10 he goes to bed. Then it is just me.

There I am. No one to wait on. No reason to clean. No one to watch over. Nothing but me, the computer, TV, books, etc. I check e-mails. I catch up on shows. I do things for me. It is quiet. It is nice.

Then, around 10:45 I realize I should already be in bed. I kick myself for staying up so late. Once in bed I can't sleep because I need even more time to wind down. Around 12 or 1 I am usually asleep.

I didn't use to have this problem... but then... I didn't use to have kids. Do I need to be more disciplined? Do I need to find other "me" time? Or can I just keep going on like this?