Below are the main rubriks (i.e strongest indications or symptoms) of Nux Vomica in traditional homeopathic usage, not approved by the FDA.
Sleep and dreams
Cannot sleep after 3 a.m
Until towards morning; awakes feeling wretchedly
Drowsy after meals, and in early evening
Dreams full of bustle and hurry
Better after a short sleep, unless aroused.≡ more ...