This is a common problem for people who sleep under fans, sleep with CPAP machines for sleep apnea, have dry eyes, have had eyelid surgery. The treatment is turn off the fan, humidify the bedroom and put a lubricating gel in both eyes at bedtime (e.g. Genteal gel, Refresh Liquigel, Refresh PM) On awakening put in a set of regular eye drops (e.g. Systane, Soothe, Blink, etc)