For several weeks each year, I live on an inverted timetable, as I do nightshifts for work (cannot opt out.) During this time, I wake at 20:00, work from 22:30 – 8:30, (eat ‘lunch’ at 1:30 a.m.) and sleep at 10:30 (a.m.). I have ‘breakfast’ style foods at 20:00 and ‘dinner’ style foods at 9 (a.m.) My whole life is flipped. (I do not ‘unflip’ on the occasional night off during these few weeks as it messes too much with my circadian rhythm.)
Should I then say modah ani/morning prayers/blessings when I wake at 20:00? And the night shema/vidui when I go to sleep at 10:30 a.m.?
Or are those particular mitzvot independent of my actions, and entirely based on the sun/time of day?
Any answers/considerations would be greatly appreciated, (including from Orthodox, Reconstructionist, Reform, Conservative viewpoints.)