Its a common problem as you get older. First off do you you sleep with a fan on? Some people's eyes dont close when they sleep and stay partially open, the fan will certainly dry them out but if you have always done this then thats probably not the case.
I keep rewetting drops (artificial tears) right next to my pillow because my eyes are really dry in the morning, and I immediately put drops in each eye before even getting out of bed. It makes my day much better, almost like if I leave them dry they get all irritated and the entire day they itch and bother me. Putting drops in immediately when I wake up really helps that out.
By the way make sure any artificial tears you are use are the preservative free ones if you are going to be doing it daily. The eye doctor told me that, because preservatives are bad for the eye if you are putting it in all the time.