Night movement/disruption rule

[Brett Nicholson]

My first question concerning night-time disruption/movement is if a unit has already become disrupted from movement does it next become demoralized if the disrupted unit moves again before recovering?. I have read one AAR where it suggests that it does become demoralized. The second question concerns assaults. An assault is a fire activation that requires movement but does it count for night-time disruption?. Then, if the assault does count for disruption do the units become disrupted prior to the assault or after the combat? I don't know if these questionfs have been addressed elsewhere or if 4th edition covers this in detail so any takers?