When I started on clomid, I took it in the morning and I didn't really feel a difference. That said, it takes time to kick in. A few weeks into it, I started taking it at night and I would wake up with morning wood, which seemed like a good thing. I don't know if it is because I take the clomid at night or if it is because it finally kicked in, but I continue to take it at night and wake up happy.