I beg to differ bcseeds, but it's indicas which have the high CBD content, not sativas. Indica is a heavy smoke, painkilling and anti-insomnia, this is because of the HIGH levels of CBDs. Sativa have LOW levels of CBD, leading to the clear uplifting high they are known for. CBD is the compound which gives you the monged tired feeling, not the other way around. Check out this thread, it's interesting:
http://hipforums.com/forums/showthread.php?t=189129
DSChill, My Gran has the exact same problem as your mother, her spine is slowly crumbling. For years she couldn't sleep more than an hour at a time because the pain was so bad. My mother was staying with her a few years ago and was having a spliff out on the balcony. For the first time in her life my Gran had a few tokes at the age of 71, and she slept the whole night through. Now and for a good few years she has a toke when the pain is bad and one at night, and she can function better than she has in years. Pure indica is damn good stuff for dealing with that sort of pain, I can recomend good old Northern Lights. It's great for pain and easy to grow with a quick yeild - perfect for the medical grower.