20 week old DS (big boy) has suddenly starting turning himself in his cot and wakes himself up with his head wedged up to the bars widthways in the cot. He seems to do it by raising his legs flopping to the side and then bringing them upright...is actually quite funny but I think the odd angle is waking him. He is in gro-bag but think maybe need to tuck in light sheet round him...? Is such fidgety baba tho and dont want to anoy him...any ideas?