If you’re having trouble falling asleep or getting a good night’s sleep because of restlessness from a medical condition, or due to almost any sleep disorder, you may find there’s help in medicinal cannabis. Cannabis has been a useful aid in treating insomnia and sleep disorders going back as far as the 19th century in the U.S., before cannabis was categorized as an illegal drug. That’s because sleepiness is a well-known side effect of cannabis.