Our 4 year old has started waking up in the middle of the night and getting dressed for the day then going back to sleep or calls for us and he'll just sit on the bed until we go to check on him. He then refuses to put his pyjamas back on. This Has happened for the last few nights but when we ask him why he doesn't have any answer. He does occasionally sleep walk and have night terrors, is this part of it or just another weird thing he does.