I have 2 wrigglers who always seem to wake up in the morning curled in a feotal position trying to be warm while all their blankets dangle off the side of the bed. As a kid I slept in a sleeping bag and thought this may solve the problem of the disappearing blankets. Well, a bedwetter and typically dirty boys if I don't manage to get them all bathed every night means that sleeping bags are out of the question. Just not washable or machine dryable like I need.
Funnily enough at the camping store the guy came up with a great tip. His mum was a foster mum and she had this trick. Bottom sheets are fitted single bed sheets and the top bedding is double bed sheets and blankets that tuck all the way under the mattress, creating a nice snug cocoon that doesn't unravel easily. I don't have double bed linen but for my littler guys I just tucked the single bed top sheet and a thinner blanket the normal way but then tucked a lovely thick single blanket across the top of the sleeping area.
Both boys slept well, and even though my bed wetter still wet his bed, he was happy with the snuggly cocoon bed. And still easy enough to do the washing as it was only my normal linen, just used differently.
Try it, it worked.
Jen in Oz