Niacinamide, which is vitamin B3, will make you very sleepy. I have trouble getting to sleep due to menopause. I take 1000 mg of nicacinamide 1 hour before bed with about two small bites of food. Don't take regular niacin as it produces a flush to your skin and has other side effects. Niacinamide does NOT have these side effects or make you flush. It might be better to start at 1 pill which is 500 mg. One side effect is it may lower your cholesterol.
Niacinamide stops the chatter of the mind but take it with other B's they work together... It also helps sleep. First time I took it my mind went blank, freaked me out.