What makes my eyes red and crusted shut in the morning?

Blepharitis, allergy. Most commonly, this would be blepharitis (chronic inflammation of the eyelids). The mainstays of treatment are daily hot compresses to the eyelids coupled with careful, gentle eyelid/eyelash washing with dilute baby shampoo or a commercial wipe like ocusoft. If your vision is affected, symptoms are worsening or don't respond to the above, see your eye doctor.