I had a run-in with them 3 years ago at my old apartment. It wasn't necessarily the grossest apartment you ever saw, but 4 people living in a 3 bedroom didn't help. A couple roommates complained about having red itchy bumps in the morning. I gradually noticed tiny red spots(im guessing blood) on my sheets. Finally my roommate woke up in the middle of the night to one biting him. Went in to total freak out alert. Tore up all the beds, found them lining the mattresses. Ended up having to get the place fumigated every other week or something like that. Gradually they died out. Worst months of my life. Luckily they didn't transfer anywhere else.