Been working shift work for 33 years, that's right 33 years, 12 hour shifts. Monday Tuesday 7-7 days, Friday Saturday Sunday 7-7 nites, Wednesday Thursday 7-7 days, Monday Tuesday 7-7 nites, Friday Saturday Sunday 7-7 days, Wednesday Thursday 7-7 nites--- and then it starts all over again.
I have gone through just about every disturbance known to man while sleeping, car alarms, smoke alarms, nieghbor calling with medical emergency, thunderstorms, hurricanes, power outages, nieghbor using a bulldozer, dog eating the meter reader, car wrecks, train wrecks (true), emergency recall to work, you name it, I have lived it.
Some times you role over and go back to sleep sometimes you don't, working shift work it's all about lack of sleep and how you deal with it. If you are working shift sleep deprevation is a way of life-- make friends with it.
Example-- Working nites Wednesday and Thursday, got up Thursday after noon at 1400, lots of stuff going on Friday, no sleep, so I went from 1400 Thursday to about 2200 Friday with ZERO down time, what's that 36 hours? Slept from 2200 to about 0530, up and on the tractor for 0600, grandkids, church fair, my dad, lunch, sno balls, daughter's birthday, back in bed for 2200 last night. Slept in this morning didn't get up until 0630 heck half the day gone sun was up. On the tractor for 0730, 2 hours on the tractor. 0930 worked with horses for a couple hours, then came in for a shower/shave and a nap. Well I got the shower and shave, 6 year old grand daughter, so it's out to the swimming pool in a minute. This is routine for me, and has been most of my adult life.
Get to go back to work in the morning, I'll get some rest then!