It’s allergy season, and everyone around you is suspicious your sniffles are contagious.
It might be hiding in places near your bedroom, like the bathroom.
Definitely do a quick mold hunt and eliminate any you find.

If you’re feeling really ambitious, you should go out and get yourself a dehumidifier.
Mold loves moisture so keeping things dry should help (viaCarolina Asthma & Allergy Center).
Beyond that, experts say when allergy season comes around it’s a good time to revamp your bedroom.

If it’s possible to get rid of your carpet, definitely do that.
If not, verify to vacuum daily.
to prevent the little guys, use a dust mite cover.
An air purifier won’t hurt either (viaHealth).