"no-see-ems" are those little flying insects that come out around sunset. My wife tangled with them in Crystal River when we went out to see the manatees. They are called no-see-ems, well, because they are so small you can't see em. You can when they are in a dense cluster. For such a small insect they sure pack a wallop of a bite. My wife's legs where covered with bites. The bites swell up and itch like crazy.
She and her husband moved into a new apartment (Chicago suburbs) last Fall. Their mattress was brand new, the furniture store delivered it with the plastic still on it. Well, shortly after moving they both started getting these bite marks all over but had no idea where they was coming from. They went to several doctors and dermatologists, but couldn't figure out what it was. Finally, like 3 months later, they realized it was bed bugs.
She said the other apartments had to be cleaned also because they bugs can travel through the walls. 
This could give a whole new meaning to the posts titled "Bitten by the Concierge bug" 
. No blood on the sheets though.