I have been on it for a couple months now (went from 25mg to 40 to 80) and was told to start taking it at night, because it can make you drowsy, then work towards taking it in the morning. When I took it at night, I had really weird insomnia, waking up at 3 or 4AM and not being able to go back to sleep, so I pretty immediately switched to the AM, but like @cleverfunnyname said, you should ask your Dr. and adjust accordingly with their input.