16-hour Stopover in Dubai

I was here just long enough to sleep in a comfy hotel room.  With jet lag and the long flight, I didn't really feel like trying to explore the city.  By the time I got to my hotel room, it was about 8 pm, and I needed to be back at the airport the next day by 9 am.  I took a shower, had dinner, and went to sleep.  Not much to report.
I did make a few observations.  (I did do a three day stopover here on my way to India in 2019, so I did see the city earlier...) The subway has a special car for women and children.  Men caught in this car are fined.  The airport is beautiful and silent.  There are no announcements, it is very clean and bright.  The airport really feels more like a fancy hotel than an airport.
I did have an unusual experience going through passport control.  My last name was different than the last time I was in the country (I was a little late changing the name on my passport), so I had to go to a special office and they scanned my eyes.  That's the end of the story.  Not a lot to it, but it was the most exciting story I have so far trying to get into a country.  For a few minutes I wasn't sure I would be allowed in.  They were very nice and efficient, and within a few moments I was through the gate and on my way.