I was only on 25mg in the end and still sleeping up to 14 hours a day and super depressed. It didn't do anything it was supposed to, just drained my will to live. I came off of it since my dr wouldn't let me try anything else and went into a hypomanic/manic episode, which was fun. I can't imagine taking 300mg. But I have heard that the sleepiness wears off eventually. It didn't for me in the 2 months I took it.