You should know that the eye irritation you woke up with, and your mascara particles could have been the cause. Mascara particles probably got into your eye while you were asleep. This might result in redness, itching, or even the feeling that a foreign body is sitting in the eye. You can treat your irritated eyes by getting all your makeup off and washing your face before sleeping. If these steps do not work then definitely seek the help of an ophthalmologist.