The present findings support the proposal that CBD do not alter normal sleep architecture. We found no differences between CBD and placebo in respect to polysomnographic findings or cognitive and subjective measures in a sample of healthy subjects. Unlike widely used anxiolytic and antidepressant drugs such as benzodiazepines and SSRIs, the acute administration of an anxiolytic dose of CBD does not appear to interfere with the sleep cycle of healthy volunteers. Future studies should address the effects of CBD on the sleep-wake cycle of patient populations as well as evaluate the chronic effects of CBD in larger samples of patients with sleep and neuropsychiatric disorders.