Here's what I have on Cannabis and sleep modulation. - Granny:hippy:

Cannabidiol, a constituent of Cannabis sativa, modulates sleep in rats.
Cannabidiol, a constituent of Cannabis sativa, modulates sleep in rats.

Dronabinol reduces signs and symptoms of idiopathic intracranial hypertension
Clinical Studies and Case Reports

Cannabis-based medicine in central pain in multiple sclerosis.
Clinical Studies and Case Reports

Two cannabis based medicinal extracts for relief of central neuropathic pain
Clinical Studies and Case Reports

Functional role for cannabinoids in respiratory stability during sleep
AAMC: Functional role for cannabinoids in respiratory stability during sleep

THC reduces sleep apnoea in animal research
IACM-Bulletin