Nasal congestion, severe sore throat at night. but only slight throat irritation during the day. could it be post nasal drip?

Post nasal drip: Post-nasal drip often leads to a sore, irritated throat. This can cause discomfort or a feeling that there is a lump in the throat. Often caused by allergies or other irritant triggers. Successful treatment of the post-nasal drip will usually clear up these throat symptoms. OTC and prescription nasal sprays are often indicated. Talk with your primary doctor about what options work best for you.