Waking up with clusters of itchy, swollen bumps is a frustrating experience that may point to a hidden problem in the bedroom. While several conditions can cause similar skin reactions, repeatedly developing welts after sleep is a reason to look more closely at your bedding and furniture. Experts stress that identifying the source is essential before choosing any treatment.
In brief
- —Bed bugs hide in mattress seams and bite at night
- —Not all sleepers show visible bite reactions
- —Professional treatment needed for large infestations
Nocturnal feeders that hide in plain sight
Bed bugs are small, reddish-brown insects that feed on human blood while people sleep. Because they are nocturnal, many people never see one until an infestation has grown significantly.

Their preferred hiding spots include mattress seams, bed frames, headboards, furniture joints, and even behind wallpaper or electrical outlets — places that are rarely disturbed during routine cleaning.
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