How can i get rid of my runny nose overnight?

Antihistamines: Dust/pollens/allergens are trapped to the inside of your nose as you breath and there they can cause allergic symptoms..Thus cleaning them out will help reduce your symptoms. Good air-filter can help. If needed, antihistamine meds such as benadryl, (diphenhydramine) zyrtec, claritin, bromphiramine etc...Are decent allergies meds and can help dry out your nose and reduces sneezing etc...Consult your doc..Good luck.