I like watching Pretty Little Liars at midnight because it makes me anxious and excited at the same time. Once I get really, really creeped out, I then watch How I Met Your Mother or Big Bang Theory or 2 Broke Girls or Modern Family just to make it a little lighter inside.
Sherlock. Even though there are only 9 episodes, it's still the best by far. EVERY HOUR IS A GOOD HOUR TO WATCH SHERLOCK. ;)
mentalist...you never ever get bored with this show so whenever the repeats come at midnight i make sure i watch it! :)
Do you mean at midnight?
If so then anything like Breaking Bad.
TWILIGHT ZONE
"Saw"
"Fringe"