Bed bugs can survive in upholstery, in clothes as already stated, on blankets, sheets of course, behind bedroom furniture, all sorts of cracks and crevices, mattresses, almost anywhere. They are fine in cold or hot environments, and are attracted to a warm human body as well as the carbon dioxide we breathe out.
How bed bugs survive, however, is on the blood of their victims. It's not a pleasant thought, in fact it's downright creepy, but that's the way it is. They usually get to work just before dawn, but they won't wake you up because you won't feel them. The reason for that is they inject a numbing agent as they bite you so that it won't hurt you. That might sound like a nice thing to do, however once that agent wears off, the bite will be very itchy (but don't scratch it!) and it may come up as looking like a rash, or spots with pus in the middle. As they don't carry any diseases, however, bed bugs are not dangerous, and it is only if you scratch the bites that there is a risk of getting an infection. In any case, you certainly will want the best bed bug treatment to be rid of them as soon as possible.
Rats and mice can be a common problem for many domestic customers, as well as commercial customers too!
There is a saying that we are no more than 10 feet away from a rat, with estimates of the numbers of rats and mice in the UK varying wildly, from a few hundred thousand to millions. In all honesty, none of this matters; all you are worried about is being rat or mouse free in your property!