Here's some inspiration for films to watch in the dead hours of night:
Time Out's 100 Best Horror Films.
That's a distinguished cabal of horror experts they've polled there. Unsurprisingly, they've come up with an extremely solid list.
I'm not sure what my top 10 would be. Hellraiser, The Thing and Ring would be certain inclusions. Probably Night of the Demon as well (brilliant black and white horror film). After them...well it's lists, it's always impossible to include everything. Just about everything on that list is excellent, so rather than more nods to The Exorcist, Evil Dead II, etc., here are some horror films I like that aren't there:
In the Mouth of Madness
Carpenter does Lovecraft from first principles.
Unfairly maligned for kickstarting the torture porn thing. Unusually for horror franchises, the sequel is good as well.
Superb Korean monster movie.
The first half of Jeepers Creepers
Horror films are easy to make but so hard to do well. The thirty or forty minutes of this are brilliant...then it plummets off a cliff into mediocrity.
The Quatermass Xperiment
This shouldn't really be here. They butchered Nigel Kneale's original story and replaced a humanist ending with Kill It With Electricity! but I have a soft spot for the film as it scared the pants off me as a child.
A stretch for a horror list I know, but the whole film is a masterclass on how to make a monster B-movie and populate it with living, breathing characters.
I'm still waiting for someone to make the quintessential succubus film.