If you share your bed with a pet or wake up congested, a 2025 study might explain why. Research published in the Journal of Allergy and Clinical Immunology analyzed bedroom allergen levels from 3,399 U.S. adults and found that nearly 4 in 10 had elevated pet allergens in their sleeping space, with dust mites close behind at 38.5%. Both were associated with sleep disturbances ranging from frequent snoring to sleep disorder diagnoses. The findings suggest your bedroom air is worth a closer look, especially if you've already ruled out the usual suspects.