That is about sailing alon. In general it depends from the person to the person how much someone is ready to risk.
My eletric autopilot makes a lot of noise with alarm when it’s out, because of load. And then i stay and drive manualy to reduce speed and ungage again the autopilot.
Also soon i did learn to hear ewery new sound which was singn of deanger. Always sleeping with one eye open.
But it can happen if you try to hard to stay awake, to fall asleep on the leags. You know thats why sailors easly write books-they have somthing to tell.