The only sleep problem my son has ever had was when he was 8 or 9 he started sleep sweating. He would wake up drenched in sweat, his pillow soaked half way through. It wasn't summer and he wasn't having nightmares. His doctor never had a good explanation and after a while it got better. But ever since then he has slept under just a very light fleece blanket. I can't imagine putting him under such a heavy blanket.
Call me a skeptic but I can't see how it would hurt to try. I hate anything very heavy on me while I sleep. But I'm sure different people have different preferences.
