we had a fail of a dream feed tonight (it was less dream, more look around and chat) as he oke up a little earlier than the feed usually happens! Now he;s been having a 'cot party' moving around, kicking the wall, making little noises etc.. but not really crying or calling out and has been up for nearly an hour... He's 5.5 months old- what could have caused this- and what should i do about it.. when should i go in and try to 'calm' him? He sleeps in a little zip up, arms in sleeping bag...