A main effect of the little white pills is elevated metabolism… and enhanced wakefulness which is why I take them. The downside of the pills is that in the begginning they *do* tend to keep me awake at night. Not that I’m complaining as such, even though I’m sort of sleepy… I’m just not sleeping. It wears off in a week or so and my patterns will be back to normal, I just woke every hour all through the night until I got up at 6:00 a.m. to let the dogs out.