Over The Counter Sleeping Pill side effects?

I am undergoing a different situation these days. I lay awake whole night and sleep completely remain away from me. I don’t know what has caused such situation to occur but it is proving to be very much dangerous for me and my health. I have heard of sleeping pills which help a lot in good night sleep. There is Over The Counter Sleeping Pill available on chemist shop which does not need any prescription. I wish to know about Over The Counter Sleeping Pill side effects.