When you're asleep, you're asleep. At that point, it doesn't much matter whether you have someone to "cuddle." You can do your cuddling, and whatever else you like, when you're awake. When you need to sleep, you can go to a separate bed, or another room.. Nowhere is it written that couples must sleep in the same bed, and no one should expect one, or both of the people, to lose sleep because of the other's annoying habits.