Causes for sleep disorders

My Dad who is at his early 60s, Nowadays he has always been complaining about the sleeping disorders in the recent years especially after the retirement. I read this interesting article on my way back in the Flight that was appeared in the popular Indian Daily Hindu. After reading this I am thinking about suggesting my Dad to eliminate the root cause of the problems mentioned in the article. Here is the very same article for you to read and get benefited as well...