Gosh, I am so glad you asked this because I was JUST thinking about this last night. It was so quiet without my BF there that I had no idea what to do. He used to listen to music and type on the computer right next to me as I slept, but that was missing last night.
I could NOT sleep and it was so frustrating, thus making it worse.
Enough rambling, I just want you to know that I wonder the same thing! What do they think about? How are they ok with their own thoughts?