No touching!
I thought this was hilarious. A blanket chastity. I knew growing up it was considered inappropriate to pleasure yourself at night but somehow my hands would have a mind of their own and I'd wake up with the blanket off the bed, underwear at my ankles and rubbing/feeling every part of my "no no" zone in full view of anyone who would happen to walk in.
Like sleepwalking but sleepwanking... wish I had a chastity growing up or fasten that damn blanket with rope to prevent embarrassing situations!