On my 8mth Ds who sleeps on tummy but has just starting waking up several times a night when rolls onto back.
He goes straight back to sleep when i roll him back-sometimes without lifting.
Thats why i don't think is waking due to hot/cold/hungry/pain.
Over christmas and new year we stayed away abit and he fit in my friends moses basket for 2 nights sleeping 8hrs solid (which he hardly does at home!)!! Her basket is far bigger then mine as i tried ours when the waking started...
Or any other ideas? He is waking every 2hrs approx... don't feed him till wakes after 2am.