I do grind on about it like an old wheel but there are good reasons why long chain Omega 3 found in fish oil and balancing the Omega 3s and 6s may help with sleep as well as providing other health benefits.
These fats are fundamental to body function.
Have a look at some of these NIH videos if you need convincing.
http://www.omegasixthedevilsfat.com/resources.aspx
Please discuss dietary change with your doctor.