Completely agree most have a purpose, but they are not good for you. If there is a natural solution it will always be best.
Something I read last night might be of interest to you about sleeping patterns and how modern thinking of sleeping for the entire night is not how it's always been and may not even be the most effective for all people. I'll let you read it without saying more about it. It's interesting as my sleeping patterns are always messed up, but never personally called it insomnia...but others probably would.