What are other people's experiences? I've bought a Grobag for DS but he doesn't seem to sleep very well in it at all... he's getting too big for most wraps you can buy so I'd started using cot sheets instead and then bought the bag, thinking that in winter it would be a great option, but now I'm not so sure... half way through his sleep today I gave up and wrapped him again because he just wouldn't settle in the Grobag. Have I wasted $85?