I'm currently trying to become a polyphasic sleeper - where I sleep for 2 hours a night and then nap occasionally throughout the day.
Info on polyphasic sleeping is here:http://en.wikipedia.org/wiki/Polyphasic_sleep
My blog is here: http://polyphasium.blogspot.com/
I'm much more alert throughout the day and the sleep I get is of much higher quality than before. Others who have tried it have reported it helping or curing all kinds of sleep disorders. So far for me it's awesome.
Some people who get stiff from sleeping report that they no longer have that problem because their body isn't in bed long enough for that to occur.