It certainly seems to have a knock on effect that continues well into the next day. The stuff does its job of knocking you out more effectively than anything else i know of at the moment. I dunno if its possible to get addicted to it, i quite like the feeling once it kicks in and before it knocks you out, it's a perfect substance for a wreckhead like me, so i try not to take it too regularly. Once I'm off kratom, i suspect it will be a hell of a lot easier to sleep, as that is proving even worse than coffee in terms of keeping me awake all night if i wasnt taking loads of downers to counteract it.