I don't think you have a problem if both pupils are the same size and equally and briskly reactive to light. If you are concerned, see an ophthalmologist for an evaluation. One other comment: sleeping in your contacts increases the risk of corneal infection. Discuss this with your eye doctor, replace the lenses and cases frequently, and follow all lens care instructions for cleaning and disinfection.
I should also note I sleep in contacts usually. They're silicone lenses.