Cannabinol (CBN) is a weak psychoactive cannabinoid found in trace amounts in cannabis. It is made from THC as it degrades over time, so is found in moderate quantities in poorly stored or old products.
Its main effect is as a sedative, CBN is the strongest cannabinoid for promoting sleep. It generally retains all the other positive effects of THC, though with much less potency. It shows promise in treating Glaucoma, treating convulsions and as an analgesic.