insomnia
"Been taking for 4 years 1/2 tablet 12.5 mg. >20 years fell asleep them wake up stay up.  Now sleep almost every night all night. No side effects noticed. Drowsy if take whole tablet but good on half. I freak if I forget them on holidays cause I know I won't sleep. No better or worse than before I started taking them but I just love my sleep and hate not sleeping. So thumbs up. I take no other meds or drugs."