Sleeping Duty
The Gemara in Nedarim (15a) says that an oath not to sleep for three days is considered to be a shevuas shav, a vain oath. It is not physically possible to stay awake for three days.
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Medicine and Health
How Long Can a Person Stay Awake
The limits of human wakefulness, record attempts to stay awake, and how microsleep explains apparent feats beyond three days.
Sleeping Duty
Before I started attending an early-morning daf yomi shiur, in my ignorance I envisioned that many attendees sleep through most of the shiur.