Your reliable source for all things that keep you awake at night. Check under the bed and in your closet. Lock your window. Charge your flashlight.
...Not that it will help you.
This is not a gore blog and will be Safe for Work unless otherwise noted, because the creator of this blog would like to think that there are more creative ways to scare people than posting someone missing an appendage, etc.
"Nightmare Fuel" can be defined as anything that fuels nightmares. It's that simple. And because it's so simple it's so easy to find.
Sources for our nightmare fuel frequently come from any of the following:
nosleep (Subreddit for creepy stories)
/x/ (4Chan's Paranormal Board)
As well as YouTube and a variety of other miscellaneous sites.