My blanket stays cozy all night. I've recently been cuddling a hot water bottle all night too, due to stomach pains from a new chemo drug. But I have to keep getting up every 2-3 hours to refresh the bottle, since its gone cold :(

ah, you need to put boiling water in it. I know I know, you're not supposed to, but if you check it regularly to make sure the seals aren't wearing and there's no leaks they seem to be fine! You just have to wrap a towel around it for the first 2 hours otherwise its too hot!

I do put boiling water in it. My bottle is very very hot. But I am very very cold, and after not very long my bottle is too ;-)

I use a wheat bag, four minutes in the microwave, too long according to instructions ( we are such rebels on here :-) ), but keeps toasty warm for ages. Does burn out after a few months but not too expensive to replace and better than blue, or worse white, feet.

Chuff