is it really a true "bed bug"? I read that they tend to hide out during the day where you won't see them, in places like under the mattress, so often you don't see them when you change or wash the sheets. they emerge at night, to (yes) suck your blood. (sometimes they even live inside the mattress, emerging in the night from tiny holes in the fabric. Unless you cut the thing open, you'd never even notice they were there. But there could be a colony of literally 1000s of them right inside the mattress you sleep on each night.) in the morning, you will notice odd itches on your legs and arms. you may feel tiredness, nausea, and have headaches during the day (possibly some kind of allergic reaction to the bed bugs' bites). I'd rip the place apart, and drench everything in insecticide 😛
but then again, maybe it isn't a bed bug 😛