although "funny" responses seems to be the trend here, here's my real opinion:
you may have dry eyes in the morning. its like if i fall asleep with my contacts in my eyes dry out, and even after i remove the lenses when i wake up they remain dry and are red and irritated.
drink more water. or get those tiny eye cups and soak your eyes with water before you sleep every night, or even in the mornings when they're most effected. sounds gross, but its not at all painful, quite soothing really.