I can tell you (from personal experience) that bed bugs like to bite in groups, not one or two normally. Also, they prefer warm, moist areas. When I ran into them they covered the bend in my elbow and the backside of my upper arm and side near my arm pit. If you look at them in the mirror it looks like a bad rash and they itch like mad. It took a few days using calamine lotion to get rid of the rash. If you're really paranoid about bed bugs you can get a cheap UV flashlight (about $10 on Amazon) and check your bed before laying on it. Make sure you check the edges.