Having spent many days and nights at sea in an aircraft carrier, my tiny stateroom just below the flight deck and near one of the steam catapults (on any list of noise-makers, close to the top!), standing regular watches on the Bridge and in CIC, so that sleep (when possible) was at best in 3 1/2 hour increments, I learned to sleep through anything, much less the cycling of small refrigerators. Light? I soon learned not to begrudge my roommate light to dress by, when he was going on watch, and the red night-vision lights in the passage way (no door, just a curtain) were unobtrusive.

Awakened all too many mornings at 0330 to stand the 04-08, "The watch that ends the night", 50+ years later, I have no trouble "Z-ing Out" while my wife watches late night TV.