Final answer:
Diphenhydramine, an antihistamine drug, might be recommended for a patient complaining of cat allergies affecting sleep.
Step-by-step explanation:
The medication that might be recommended for a patient complaining of cat allergies affecting sleep is diphenhydramine.
Diphenhydramine is an antihistamine drug that helps reduce or eliminate the effects of histamines that produce allergy symptoms. It can relieve symptoms such as nasal congestion, sneezing, and hives caused by pollen, dust mites, or animal allergies.
It's important to note that chronic allergies may require consultation with a medical professional for longer-term treatment.