If we were to look one area where we need more research, it's in comparing different strains of cannabis. A lot of what we know comes from talking to people who are using cannabis rather than administering the cannabis ourselves, so it's very hard for us to characterize what kind of cannabis people are using. There is some evidence that CBD can be helpful for sleep. THC can also be helpful for sleep. Also, the combination may be helpful. THC, to the extent that it dulls pain, can help with sleep. CBD is more directly tranquillizing.
On February 27th, 2019. See this statement in context.