Since I've been back on night shifts I sleep roughly 4 hours, get up, have a full day and then work another night, repeat.
I wouldn't be able to stay awake if it weren't for energy drinks. I start at midnight, so it's an awkward shift, you can't sleep beforehand so it's a stay up, sleep in the morning jobby which I can't do, I'm an early bird and I never nap.
Still can't do coffee even though I love it, bloody migraines.