obsessive compulsive disorde
"Puts me to sleep like turning off a light switch. Which has greatly helped me work and be on a normal schedule. Before I would stay up for 24-36 hours straight, then sleep 15  hours and then repeat. Been taking it 7 years.

Now when I decide it is bedtime, I take it and 9 out of 10 times I am sleeping in 20-60 minutes. It works just as well for me at 25 mg or 200 mg....same effect. 

Personally, 15 minutes after I take it though I absolutely will not give my OCD the time of day, not because it goes away but because if I do the medicine makes it harder to focus and deal with whatever is bothering me and it can go on and on worse than normal. And the more drowsy I get the worse it is to focus."