Bed bug (likely)

Hides in mattress seams, upholstered furniture, bed frames, and cracks near sleeping areas; can also occur in other indoor furnishings.

Nymphs and adults feed on blood, usually from humans and other warm-blooded animals.

Flat-bodied, wingless, and mostly nocturnal; they hide in tight crevices and may leave dark fecal spots or shed skins. Females lay eggs in protected locations.

Bites can cause itchy skin reactions and disturbed sleep, but bed bugs are not known to transmit disease. Confirm identification before treatment, since the image is blurry.