If you flipped that all around you'd get me.
I can't sleep with out it.But I suffer from severe insomnia so...I'm wondering if the strain you smoke makes any difference for you?
Have you tested yourself for how you react to sativa and indica?
Normally indica would knock you right out.It does for me.
Now I have had those sativa strains that make your brain feel like it wont stop...like your laying in bed and you can't stop thinking and picturing shit in your mind.But thats pretty much how I feel anyway...so I have my day time smoke(ussually sativa ) and my night time smoke(indica).
It is possible that your insomnia is not related to cannabis at all.And your simply becoming an insomniac like me. I wish I could help you out more.Other then telling you to grow some strong indica,I don't know what else to say.