I want to effusively thank the anonymous person that suggested this trick to keep those pesky heavy blankets off your toes. Because there's times when even a sheet hurts. It goes like this and costs nothing:
See what I did there? First, tuck your sheets and blankets in snugly at the foot of the bed. Then take a firm pillow and jam it under the covers so that it's standing up on edge. I would have used a photo that showed my feet happily snuggled in there but my pedicure is not particularly attractive right now.