Harriet said

Maybe this is the explanation of the Andromeda phenomenon through which, most episodes, one of the crew seems to have the week off. At first, they used to explain their absence; now it just happens, but perhaps it's just that so and so is having a nice sleep and no one wants to wake them up just to mention they're facing imminent death.

Its *is* possible. I suppose it depends on how often they face imminent death. I have ordered (in a purely business context) one of my best people to go home and get some sleep during a crisis on the basis that if we had another crisis in the morning, I wanted someone with some brain cells still functioning around to deal with it.

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