yeah, it was the same back when i was on a fast attack sub in the 1970s...and here's the fun part--2 other dudes shared my bed/cot...it's called hot racking...I sleep for 6 hours, then get up and go aft to stand watch or do maintenance, and dude #2 gets in the same cot and sleeps for 6 hrs...he then gets up and dude #3 gets in for 6 hrs...you get 6 hrs in bed per day...FTN...