Well, what happens is, I am briefly tired for about 5 minutes immediately after taking it, but if I lie in bed I'm immediately wide awake. But about 2 hours lat

Well, what happens is, I am briefly tired for about 5 minutes immediately after taking it, but if I lie in bed I'm immediately wide awake. But about 2 hours later I'm legitimately sleepy. But it's certainly possible both effects are real.