Jabo as such it wasn't,but one of the aims of night-time Intruder sorties was to cause enemy airfields to close, forcing inbound aircraft, possibly already low on fuel, to divert elsewhere.
Holes in runways and blazes in hangars helped the closing process along, also a clear indication that there was an Allied aircraft lurking about, so a bomb load is perfectly legit.
A real night war would be even more legit, but I reckon that's CT stuff.
Cheers,
Scherf