Gasax
In that it stated that flying at night was no more dangerous than during the day.
They just missed out a bit.
Except if you end up in the water in the dark - escape from the helicopter and rescue from the sea becomes much more difficult and chances of survival are much lower.
We were lucky the 225 ditchings were in daylight with calm seas. In darkness with rough seas the outcome could have been much worse.
But I know this and I accepted the (low) risk when I chose to work offshore. I still think more chance of harm driving to/from work every day than getting in a chopper. Could be wrong with stats now though over last few years.