I have not noticed any insomnia from it at all. However, I can pretty much fall asleep if I sit still for 10 minutes so I may be in the minority.
Where I find OxyCalm being worth its weight in gold is for concentration, focus and calmness. It allows me to have an incredibly clear mindset. I am also a business owner and I experience a lot of stress and anxiety through the day as well as I have to remember practically everything and stay calm through it all.
OxyCalm helps me make it through my normally hectic workday and I still feel fresh and ready to hit the gym at night. I maintain a high-level of energy throughout the day, but it is nothing like a caffeine, effedrine type energy. It is a calm and confident energy and I feel like I have everything under control.
A very unique and beneficial product to say the least!