As far as I have learned, Cannabis products made of the CBD-rich "Indica" species (or sub-species, depends on the botanical opinion), use to combat PTSD, and anxiety and for muscle relaxation in some cases of fibromyalgia (and maybe also idiopathic hypertonia);
Many drugs combating PTSD and Anxiety often used off-label as sleep aids (either to permit sleep, to prevent dreaming, or both):
- Certain B vitamin complexes (and maybe also Emoxypine which is similar to vitamin B-6), often used as first-line therapy to combat stress disturbing sleep
- Amitriptyline for anxiety used to permit sleep
- Diazepam for Anxiety used to permit sleep
- Prazosin often used to combat PTSD-associated nightmares
I don't recall any strong evidence that cannabis (which also combats PTSD and anxiety) is used as a sleep aid but I might just missed such evidence; beyond that, I recall anecdotal evidence about cannabis indica used as sleep aid to both falling asleep and prevent dreaming (this might be the main PTSD combating effect).
Is there a convention between sleep medicine physicians to treat any sleeping disorder with some medical cannabis preparation?