Night Fatigue question

[Mr Grumpy]

On the assumption that the night fatigue opt rule is selected......

Night Fatigue – with this rule selected, units that are active during Night turns will accumulate fatigue. The amount of Fatigue accumulated is up half the amount a unit would normally recover during a Night turn. It does not matter how far a unit moves or how many movement points are expended. Even units with no Fatigue may gain some variable amount of Fatigue if they are active during Night turns under this rule.

So if you move or fight you can accumulate up to half the fatigue you would have recovered.