Are you a regular computer user if so it might be computer vision syndrome please use lubricant eye drops e.g. teardrop 2to3 times daily and rub ocupol d's eye oint twice daily on lids .
If the problem is worse at night then you can put some oint at bet time.that will not let your eyes dry.
Next Steps
do you keep your room chilled with a/c.if so please keep your a/c on26 or 27 temp .As the chilled a/c absorbs moisture quickly.
Health Tips
Follow 20.20.formula ie close your eyes for 20seconds after every after every 20minutes.keep proper distance between eyes and screen wash your eyes with freshwater frequently and don't sit facing towards acorn blowers consume lots of fresh fruit and vegetables and also do cold compresses with ice.