I have been taking the 200 mg for a week. The first day I was so excited I did not feel sleepy all day and had no prob falling asleep. SInce then I have seen absolutely no difference whatsoever. I feel sleep and tired just as usual. If it doesnt kick in soo I will drop it.... one less pill to swallow. I tried cutting it in half and taking 1 in early am and 1 at 11 am,no difference and today I took a 200 at 6am and at 12 pm and still no difference. I am SO disappointed with it.