Night Person (trait)

Night Person is a Fallout and Fallout Tactics trait. It does not appear in Fallout 2.

Fallout and Fallout Tactics
You get a -1 modifier to both Intelligence and Perception from the hours of 6:01 AM to 6:00 PM. You get a +1 modifier to these statistics from the hours of 6:00 PM to 6:00 AM.

J.E. Sawyer's Fallout RPG
When performing actions at night (6 p.m. to 6 a.m.), you do things better. During the day, however... It has nothing to do with the level of light, just the time of day. You're not a morning person. +2 to all skill checks at night, -2 to all skill checks in daytime.

Bugs
In Fallout tactics ver 1.27, once the player levels up with this trait, it improves Endurance and Intelligence permanently, instead of just at night.

Dziecko nocy Ночное существо