I'm glad to see I'm not the only one who has been through this. I worked night shift for 10 years - LOVED IT. Then, one day, it was like someone flipped a switch. I would get in bed by about 8 am and would wake up about 11 am and could not get back to sleep. I tried everything - cool, dark room, white noise, no caffeine, not eating too late in the shift - nothing worked. That was 5 years ago. I was never able to turn my body back around to be able to make it through night shift again. I continued on day shift for a while and then finally left the NICU to become an FNP.