I've been trying to add values for this on to ingestible items and it seems to work fine but when testing in game when the player starts to suffer from sleep deprivation they get a positive effect, that is they gain +4 agility ??? I have not touched anything to do with the actual negative effects of sleep deprivation, only added some sleep damage values.
So a related question is what is the default damaging effects of sleep deprivation ??? Is it bugged by default ?
A bit of context, I've added several values on to ingestible items along with the damagesleepdeprivation values which may or may not be creating conflicts...
