As already mentioned, these tiny creatures like to crawl out of their hiding spots during the night, when people are sleeping. Once they reach a host, they pierce the skin and use their long beak to suck blood. Their feast lasts between 3 and 10 minutes, and once they are full they go back to their hiding spot.
The bites of bed bugs do not hurt, but they do transform into itchy welts. Unlike fleas who prefer to bite around the ankles, bed bugs are not fancy and will feed on any exposed parts of the body. The bites of fleas have a red spot in the centre, but those of bed bugs do not.
Bed bugs bites are usually mistaken with mosquito bites. In order to identify the source and be sure about it, you must find the insects first. So if you wake up with red itching spots on your body, make sure to search on the bed, the mattress and nearby hiding spots. Extra precaution is needed when you buy a used mattress, bed or other piece of furniture.