I'm looking for a Manhwa or Manga in which a main character has nightmares that effect them in some way. I don't want one about children (the characters should be at least 15, but preferably older), and I definitely want one with decent art. I'm fairly open as far as types of manga, and one shots are ok.
And any female characters have to have brains and some sort of strength. I don't deal well with stupidity!

If you need a point of reference, one that fits what I'm looking for is Dengeki Daisy.

Thanks!

Ciel----the character january has nightmares


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Angel Beats--best anime of the 2010 spring season

lol. seconded.

Yumekui Kenbun! It's all about a baku (dream eater/tapir) that helps people with their nightmares.

Third. :3 It's also an amazing manga <3~

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May the Chocolates of Heaven be on your side.

Thanks for the responses, guys! I read and liked after school nightmare. I'm still looking for more if there are any other suggestions out there.
Thanks again!

I second Yumekui Kenbun.
You could also try out;
Nightmare of the Funeral March
Fat
Mémoires du Masque
Yami no Kodou
Chaosic Rune
Sacred Dream
Daemonium
Witchblade
Sage
Tsukumo Nemuru Shizume
Holy Avenger