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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Nevuah
The Midrash that Moshe neither ate nor slept on Har Sinai, and why the Torah mentions only his fasting.
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.