What is biting me in bed if not bed bugs?

What is biting me in bed if not bed bugs? If you are being bitten in bed and it is not bed bugs, possible culprits include fleas, which bite legs and ankles causing itchy red bumps, often from pets, mosquitoes that bite exposed skin leaving itchy welts, spiders that may bite rarely, mites like bird mites or dust mites that cause itching, though dust mites do not bite but cause allergic reaction, or biting midges or no-see-ums that can enter through screens and bite. Fleas are common if pets present, leaving small red bumps in clusters on legs. Mosquito bites are random exposed skin. Scabies mites burrow causing intense itching at night. Lice bite scalp or body. If no insects found, it could be allergic reaction, hives, or skin irritation from detergent, not bites. To determine, inspect bedding for signs like flea dirt, check pets, look for mosquitoes, vacuum mattress, wash bedding hot, and consult pest control or dermatologist. So many insects besides bed bugs bite in bed, most likely fleas or mosquitoes if bed bugs ruled out.