Wikipedia Trails: From Nemesis to Phobetor

1. Nemesis. Nemesis is also known as Invidia or Adrestia; the latter meaning "the inescapable". Nemesis means "to give what is due". She is associated with weapons such as a sword or a dagger. Her mother is Nyx.

2. Nyx. Nyx represents the night and is seen in popular culture often, such as in video games. A moon has also been named after her. She is heard to be very beautiful and powerful. 

3. Hypnos. Hypnos, also known as Somnus, represents sleep. He is the son of Nyx and is the twin of Thanatos. His name is tied to "hypnosis", which refers to a condition where the person is put in a sleep-like state.

4. Phobetor. Phobetor is associated with Hypnos and Nyx. He is associated with dreams, but more specifically, nightmares. He lived in the Underworld in the land of Dreams.

Nyx by dragongirl. Source.