Where do bed bugs hide?

Hubby naps in the guest room once in a while as he finds ours a bit too noisy with the kids jumping all over the place. I've not changed the bedsheets for ages and he woke up with a rash all over his back one afternoon. He suspects those must be bed bugs and asked me to hurry up and get those sheets changed and insists i use hot water to wash it. He asked to to find out where bed bugs hide and says we must vacuum the whole room. We may have to change the mattress too as it's getting old too. Damn, i think i need to look up a bed bugs guide to help me out this time. So much work. But if you suspect your room has bed bugs, i've found a bed bugs guide that has a lot of articles on how to get rid of bed bugs here. You may want to check it out too.