Not only is disembarking the first day of an overnight Dubai stop possible, it is highly recommended.
Dubai Airport is open 24/7, so passengers are disembarking all night long.
I learned this the hard way. I got virtually no sleep as very loud passengers, from one country in particular, roamed the halls. Of course, I wouldn't think of naming the country, as that would be unfair. But their slamming of doors and cries of "Auf Wiedersehen!" kept me up all night.