Bed Bugs typically hide out in the folds of mattresses and bedding and come out at night to feed. For this reason, many people actually keep the lights on when they’re sleeping, hoping this will deter the bugs from coming out. Unfortunately, all this will do is keep you from sleeping even more than the bed bugs.
It is true that bed bugs are nocturnal. It’s also true that they don’t particularly like light. They also don’t like heat and so, could be a bit sensitive to the warmth that radiates from certain lights. However, keeping the lights on will not prevent bed bugs from coming out from inside the mattress or bed and biting you. Although bed bugs don’t like the light, they still need to eat. Additionally, light certainly will not kill bed bugs, or irritate them enough to make them leave your home.