I agree, but tren is not a stimulant. It has thermogenic properties, which could be the culprit, but the more I think about it the more I believe the insomnia is multi-factorial in nature. It has a lot to do with when you train, how hard you train, and what you're eating. For me, the worst insomnia is if I train past 6 pm do 25-30 sets, and eat a lot of carbs before bed. My body's chuck full of norepinephrine from the training session, and large influx of food post workout increases heart rate (need more blood to the gut to digest), and the carbs fuel the thermogenesis of the tren. Now, when I train in the morning, have no carbs past 7 pm, and take GH 4 hours before bed, I sleep like a log. Even though the insomnia isnt there every single night, it's never been this bad when I'm not on tren.