When and how should i count calories while fasting (ramadan)?

Hi everyone!
I have a quick question to ask ive been struggling with lately. Ramadan is this month, and so we are only allowed to eat when the sun is down. For me, that basically means i can only eat from 7 pm - 5:30 am.

What ive been doing lately is i eat dinner and then fall asleep right after, so around 8-9:30, and sleep until 4:30 so i can wake up and eat/ drink as much as i can before the next day starts. The only reason i do it this way is because by the time i can eat at 7, im so weak from the day of fasting that by the time i finish eating i cant even keep my head up anymore, as well i HAVE to wake up and eat so the next day is not brutal (as in i cant just eat once and sleep because then ill pass out) so id rather get a full nights sleep before waking up again vs a couple hours, wake up and eat, and a couple hours again before i go to class.

My question is, how should i calculate my calories? As in, what i was doing is that my dinner at 7 pm and breakfast at 5 am the next day is counted as one day ; but lately ive been thinking i should count breakfast at 5 am and 7 pm the same day as one day, but im not sure since sometimes i sleep between them! So how should i count it if i sleep between them? And how should i count it if i stay up between them?

As well, i use a fitbit charge hr to count the calories i burn, and now its set to reset at midnight - should i change the time it resets to sync up with the above?

Thankyou!