Mysterious Biting Bugs in Bedroom: Likely Bird/Rodent Mites from a Nearby Nest

The progression—initial psocid ID, then a fourth pair of legs visible on a later specimen, bites at night, association with an indoor/outdoor cat—points to bird or rodent mites (e.g., northern fowl mite, tropical rat mite). These mites parasitize birds/rodents but bite humans when their hosts leave or die.

Why Not the Cat?

Cats don't carry bird/rodent mites. The cat may hunt the host animals, but the mites come from the nest, not the predator.

Action Plan

1. Search for nests in/on the structure: attic, eaves, soffits, chimney, wall voids, window AC units, balcony planters. Look for birds (sparrows, starlings, pigeons) or rodents (mice, rats, squirrels).
2. Remove the nest (wear gloves, mask). Seal the entry point.
3. Treat the void with a labeled acaricide dust (e.g., deltamethrin) if legal—after nest removal.
4. Vacuum daily indoors. Discard bags outside.
5. Collect mites in alcohol for confirmation by Extension or a pest pro.

Mites don't infest humans or homes long-term without a host. Eliminate the nest, and the problem resolves. The cat is a red herring.