Hi, When I've taken modafinil, both 200mg and 400mg doses, I've been able to lay down and fall asleep afterward. The same can happen if I've had caffeine alone or caffeine and modafinil. The modafinil is legit and this even happens if I've woken up 6 hours ago. Anyone have input or theories on what could be causing this sort of reaction. I don't get sleepy, however I don't feel any more waken up and I can lay down and fall asleep like nothing is different. I seem to have no response to many other purported nootropics as well.