does it feel like a burning sensation where your conact was?
I know i get this same feeling if I wear my contacts and my eyes dry out(usually when i have my eyes closed too long such as a nap) and when i take them off they burn. Im guessing in my case im acutally taking off part of the cornea(or what ever part in on the surface on the eye) but it heals really quickly usually by morning i don't have the problem any more.