If you made the decision to increase the dose just so you can get to sleep, you are abusing drugs.
See your psychiatrist asap to get the dose reduced to the original prescription. Do not make any changes on your own. The side effects of withdrawl are not good.
Ask for a sleep med. They are designed to help you sleep, just as antidepressants are designed to help your mood. Misuse of a drug for any other reason than what they are designed for is not advised, ever.