If you’re suffering from a sore throat, it might worsen at night due to dehydration. As you will go many hours without drinking water at night, your throat gets itchy and irritated. It can also happen if you have not drank sufficient water during the daytime.
Another reason for sore throat at night is nasal congestion caused by allergies. Postnasal drip increases when you are lying down at night. So, your soreness intensifies. Exposure to specific allergens at night can also heighten this ailment.
In addition, you might experience throat problems after waking up in the morning.