Wild Lettuce (Lactuca virosa) can even be dried and smoked as a non-addictive alternative. Not healthy of course, but came in handy when I was quitting tobacco. It is not psychoactive in the usual sense but absolutely is a mild sedative. I heard it was even used by resourceful field medics during the Civil War. Use Catbriar leaves (Smilax bona-nox) as Comanche cigarette papers ;)