However, they can really be anywhere near where people sleep - furniture within crawling distance, carpet, books, phones - they've been found in all kinds of random things, because they don't create a nest, they just hide somewhere.
While bed bugs aren't actually dangerous, the bites are annoying and they can cause skin irritation and rashes, especially if you've got a lot of them in the mattress.
They crawl out just before dawn and bite you, sucking out blood for about five minutes. You don't feel anything until after the bed bug is already safely back in its home.
Bed bugs bites is not very painful or not painful at all and may simply just feel itchy. It may first look like a series of organized or lined welts that are not significantly raised. The welts may be reddish and swollen at first but will fade in a few days. The bites, however, may become extremely itchy, but scratching vigorously can result in irritating the skin.
So the first thing that you have to do is to stop yourself from scratching. You may be able to relive the itchy feeling by using a product called Corticool, which is a cream that relieves itching from insect bites and that you can buy over the counter. But if you think you are developing an allergic reaction, see your doctor immediately.