He's all alone through the day 'n' nite
Cudi is feeling isolated from everyone “day ‘n’ nite”. He also is using illiesm, or referring to himself in the 3rd person. Maybe this is to form an evaluation of himself.
To help improve the meaning of these lyrics, visit "Day 'n' Nite (Nightmare)" by Kid Cudi Lyrics and leave a comment on the lyrics box