ahh I double shift. I've been mandated into many of these unfortunately....many many many of them. Thankfully the new law came through in NY that we can no longer be mandated and I will never ever work a 16 hour shift again, I felt unsafe, I had to pee. I was exhasuted, dehydrated, and didn't have a break the entire shift and that was most of the 16's I worked, because when you're mandated it's already short... so you're not going to get a break.
Sigh... what they do to nurses.