|For the perk, see Night Person.|
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.
In Fallout Tactics version 1.27, once the player levels up with this trait, it improves Perception and Intelligence permanently, instead of just at night. [verified]