But Navy regs said that if you were allowed 1 hr sleep in 24 then you were good to go (i.e. could be court-martialled for mistakes). Yes, this has no basis in physiology. But it does have a basis in case law.....

I went a week on 4 hrs sleep at least twice in my Navy time. I learned that I personally degrade fairly gracefully (I just get slower and slower and slower). Others learned that they hallucinate.

This sleep deprivation thing is one reason why your mother doesn't want you to go into the Service. She knows you need a good night's sleep :-)