Another good reason to fly CW or F whenever you can.

If the passengers in these cabins knew about the delay it could have been quite convenient bedding down for the night.

I did similar once at BAH during the Eyjafjallajokull ash scare. We were on the ground for hours on the way from DOH to LHR and we did not take off until about 5am so I put the seat back and went to sleep. Woke up for take off and then back to sleep again and in London fully refreshed.