I was able to get a FREE hotel in 2010. I went to Etihad counter in Abu Dhabi and told them i am tired   after flying 14 hours from Chicago and would appreciate if Etihad can provide room for 15-16 hours transit.

One Indian looking lady asked me to wait few minutes and she gave me a voucher for a Room. She was so nice that she asked me if i had dinner, then she also gave me voucher for DINNER as well as Breakfast in the morning.

When i checked out , i had to sign the bill which was paid by Etihad and it was little over 400 dirham. 

It was a nice experience.

Not sure if they offer Free room now.