The causes of dry eyes various, the change of eyes surface, the inflammation of immunity, cell apoptosis of eyes, the change of hormone level, will all be the reason of it. As for the living habit causes, there are many of them, please find bellows, excessive eye using with computer, driving, reading etc. The decrease of blink times will cause lack of tear hyposecretion that lead to dry eyes and visual fatigue; the environment drying lead to the excessive evaporation of tears; hypotensor or partial of stabilizer will also affect the incretion of tears; aging, lack of sleep, mental stress, these physical reason will also lead to the decrease of tear's quality. You can check by yourself if some reason have happened in your daily life. Help yourself to have a distant view every two hours for 10min. If your work will ask you use computer in a long time, you need to eat some supplement or fruits which full of Vitamin A & B, and carotene. They are the necessary nutrients which would protect your eyes everyday. Carrot, Chrysanthemum tea, sesame, bean, milk and wheat germ are all the great choice for you. At the meantime, eyes massage will bring more comfort to your eyes.
Well, generally speaking, it is normal to have dry eyes while we are sleeping. As we know that if you do not have the necessary balance of these three layers in your eyes, or if your eyes do not make enough tears to coat the eye, you may have dry eye. And also, there are many factors which can cause chronic dry eyes, such as hereditary, immune-mediated, drug-induced, chronic allergic eyelid disease. So for your situation, I will suggest you should go and see an eye doctor, so that you can heal it. Maybe it is a problem about eye infection. Anyway, having an eye exam is a good idea. Besides, to relieve it, you can take some foods which are rich in vitamins such as the fishes and some other vegetables. Besides, if you have dry eyes, you may experience scratchiness, itching and burning on the surface of your eyes. so just be careful about it.
Dry eye is a condition where the eyes do not produce enough tears or the right quality of tears to be healthy or comfortable. With an imbalance in the tear-flow system of the eye, dry eyes can be caused by situations that dry out the tear film. Dry eye in the morning can range from being a minor irritation to full-blown chronic inflammation of the frontal tissues of the eye, causing dry eyes while sleeping and making you feel uncomfortable in the morning.