"Bipolar Rule Numero Uno: When its good its very very good but when its bad its HORRID"
I think it comes down to personal choice , some people can and some people can't. Before my daughter was born I used to work five 12hr nights a week , I used to skip a days sleep each week and only slept for 4 or 5 hours a day BUT it might have just been an extremely long period of mania AND I was in the worst relationship ever so I was screwed up at the time.
Whatever you decide to do , I wish you well.
Yeah , I can see where you're coming from , but just think , even some "well" people are unable to handle night shifts so please don't get pressured into something you don't want to do , or that might make you unwell - you know what's best for you , remember - it's your life , not anyone elses.
Take care hun ,