Hey there, Сашка! This question is for your OC who's the best at strategy.
Q: What are their sleeping habits like? When do they sleep? Where do they sleep?
(((Man, it was almost a tie between Kolya or Mitya, I chose Mitya because he doesn't appear here longer. Besides, the fact he runs on nuclear energy is more interesting answer-wise)))
"I don't sleep, PERIOD." *poked by a ten meters stick to elaborate the answer*
"Alright, I'll take a pity on your ignorance. As I am an android who is powered by a nuclear reactor, unlike those fleet mates who are conventional power androids operating on fuel, I can stay awake and operate 24/7 for a really long time without having to rest, aka shutting down my system to cool down. There were times when a patrol duty required me to operate for three months straight from leaving the base until returning to the base once again. And of course, I had to stay awake and alert underwater all the time. Another benefit of using nuclear energy is how I only need to change the fuel rods once every five years or so, thus I don't have to worry about shutting down my system, which is similar to human's 'sleep', just to conserve my energy. It should be enough for question #1.
Questions #2 and #3, I only rarely 'sleep' at the base I was assigned to when I have no mission or at shipyard during repair/modernization. For the first circumstance at the base, yes, they have accommodation which is a basic flat for us androids, too. Therefore in the base I did sleep on bed like ordinary humans. However, in the second situation at the shipyard during modernization, they will put me on a special platform that will allow them to do their job easier before deactivating my system."