Commentary for Nedarim 29:3

ואי דלא יהיב שיעורא מי שבקינן ליה עד דעבר איסור בל יחל והאמר רבי יוחנן שבועה שלא אישן שלשה ימים מלקין אותו וישן לאלתר

then, if he states no time-limit, is he permitted to go on until he violates the injunction, he shall not break his word?' But R. Johanan said: [If one says,] 'I swear not to sleep for three days', he is flagellated and may sleep immediately.<span class="x" onmousemove="('comment',' Because it is impossible to keep awake three consecutive days. Therefore his oath is inherently vain (v. Shebu. 25a); hence he is punished, and the oath is invalid. ');">³</span>

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