Ron's described the situation of the visibility of satellites very well. Their distance from Earth and their position in space relative to Earth also means that there are some satellites that can be seen through a scope even at midnight. These are only seen through a scope as they would need to be very, very far away to be able to be caught by the light of the sun at that time of the night.
Wait until you get buzzed by a satellite whizzing through your field of view across the Moon when you are looking at it! That'll freak ya!
. I've had that happen twice to me now. The first one must have been quite a low flying, and big sucker, as I thought I could just make out some of the solar panels and antennae detail. Bloody awesome buzz it gave me!