According to a 2012 study by the American Society for Microbiology, bedbugs generally feed on human blood during the night because they’re attracted to the carbon dioxide and body heat their host body emits during sleep.
Peak feeding time for bedbugs occurs between 1 a.m. and 5 a.m.
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If you’re waking up with bites that you didn’t have the night before, you may be dealing with a bedbug problem, which could spread to the rest of your house.