I'm on the sofa alot also. Sometimes I'll fall asleep there & sometimes I move later.
If I don't move out there before, I'll go when
DH gets up at 4:30 so his noise doesn't keep me up. I can't always fall back to sleep though.
Also, Rachel wakes up every few nights &
if I don't squeeze into her bed with her we both end up on the sofa. She is getting better though because
if she wakes me up she has to go to bed early the next night...although sometimes I don't enforce it because I know she is sleepwalking.