On the floor?

Last night I heard Sid wake up crying. I think he called to me and I answered back. I thought he was going to come into my room and bed but he never did. He eventually went back to sleep. When K got up to use the bathroom he went to take Sid also and found him asleep on the floor. He says it didn't look like he fell out. I wonder how he got there. Did he want to come to me but it was too dark? Poor baby. If there's a next time I'll definitely try to force myself to go and check on him personally right away.