i have this thing. after suffering long nights of "endless thinking", i decided one day to "this is enough" so i literally decided to "shut off" everything.<p>when i go to sleep, its like i have to turn the machine off. i am out cold in less than 3 minutes usually. Now, if something nags me or i have something on my mind that i am unable to shake off, then it is a difficult thing for me. it can take hours to get tired