The type of magnesium is important, one that is well-absorbed and not just a laxative. Natural Calm taken as a drink before bed is popular. Also read a hot bath with Epson Salts before bed is both relaxing and you absorb the magnesium through your skin to where it can be used. Feels wonderful...certainly can't hurt! I love it.
http://drhyman.com/blog/2010/05/20/...eral-available/