Jack has recently started taking the pillow case off his pillow every time he goes to bed. He will throw it on the floor and sleep on the bare pillow. He loves his linen sets so it can't be that. I am at a loss as to why he does it. Is it just one of those things - maybe he did it once and got a reaction? Or could there be some deeper reason for this? We have asked him why (he sometimes does answer why questions properly), but in this case he just repeats the question "why did you take your pillow case off". And if we don't ask him why, he asks the question himself anyway. Any ideas?