Mister Sandman

Mister Sandman is a Fallout 3 Perk.
 * Requirements: Level 10, Sneak 60%
 * Ranks: 1
 * Benefit: With the Mister Sandman perk, when you’re in Sneak mode, you gain the option to silently kill any human or Ghoul while they’re sleeping. And, all Mister Sandman kills earn bonus XP - on normal difficultly this amounts to 50XP per kill.

This can be preformed on children, netting you experience, but will not kill them (as they are invincible). this can be done repeatedly.