I have only taken pre-workout once. LOVED the energy it gave. It was right before I instructed a class. I do suffer with some mild insomnia from time to time. The class I teach is at 7PM. I'm usually in bed 3 hours later. The night I took the stuff I was up till 4AM. Any help? Advice? Should I forego it all together or is it safe for me to take a sleeping aid after? Just trying to gather some opinions.