I haven't looked up past posts about this yet but will. I have heard tell of some neuroprotective actions of Cannabis but the study was quite some time ago.
Luckily for me, as a CA. resident, I do have a medical/Marijuana card.
I use it 4-5 times a week right before bed and it helps me relax enough to get a great sleep. I actually like the hybrids, but I am not awake long enough to worry about the "high". What I do know is that the relief of getting into bed after smoking with the muscle relaxation it gives me is absolutely heavenly. I sometimes do visualizations at that point because I feel more open to healing. Relief is the operative word here for me.