Ok Beggy, as your own mother isn’t giving you advice, or you’re too big and clever to take it, this is what you should do. Instead of “treating yourself” again and again go to Dunelm. Buy the boys two duvets each, one 15 tog and one 5 tog,a brushed cotton bedding set each, a hot water bottle each, and a teddy fleece blanket each. I’m saying each so you’re not tempted to make them share!
Put the 5 tog duvet under the bottom sheet, make the bed as normal with the 15 tog duvet and then add the teddy fleece. Just before they go to bed put the hot water bottles in their beds. This will keep them toasty and warm and hopefully they can sleep. In the Summer you can put the 15 tog duvets away, (after you’ve washed them!) and use the 5 tog duvet on top! If I were you I’d also consider giving them something warming for tea, not pizza or chips!
If you like I can send you all the links hunipot because I know you think people are too stupid to find things online without your help ( and afilate link)
Hope this helps!