This problem is as common as dirt. The causes that need to be eliminated 1. make sure no moving air in the bedroom, no fans, no open air vents, you cannot feel or have air moving over your face. 2. determine if you eyes really do close at night. Many people sleep with their eyes slighly open at the bottom, more common is cosmetic surgery, Bell's Palsy, heavy lids. Try and avoid sleeping with your face in a pillow. 3. More of a problem in winter when air dry. Get a hygrometer that measure moisture in the air and keep the humidity at 35% or higher. if it is lower run a cool mist vaporizer in the bedroom to get the humidty up. In spite of all of these many people still are symptomatic. There are a variety of long acting night time products to put in both eyes (regualr artificial tears won't last long enought) Refresh PM, Systane Gel are good. Somewhere on the product is should say GEL, PM or night time product. Is worse cases an ointment has to be used like Duratears or Lacrilube but most people don't need an ointment and don't the blurred vision and mess. Young people often have dry eyes from meds like anti-anxiety, anti-depressant, anti-histamine, and any sinus/cold medicine.