I would most certainly NOT spend 20 hours at Terrace lounge at DXB. It is a typical terrace lounge; rather crowded and no sleeping facility, I think. You can think you are under the beautiful deck umbrella in the Province designed by Sir Terrace Conran while at this busy DXB terminal, of course.

You might consider visiting their 6-star hotel, Buji Al Arab, to see what on earth all the buzz is about this property. It is a sign of the oil money now serving newer oil money from Russia and the Cenral Asian countries. From outside, its futuristic design looks awesome indeed, and once inside,
it is tackier than most hotels in Las Vegas.
The restaurant called Sky Lounge at the top, however, offers a surprisingly competent food, IMHO.