Commentary for Sukkah 52:5
ת"ר הנכנס לישן ביום רצה חולץ רצה מניח בלילה חולץ ואינו מניח דברי רבי נתן רבי יוסי אומר הילדים לעולם חולצין ואינן מניחין מפני שרגילין בטומאה
Our Rabbis taught: One who wishes to go to sleep by day, if he wants he may remove [his tefillin] and if he wants he may leave them on. At night, he must remove them and he may not leave them on, the words of R. Natan. R. Yose said Youth must always remove them and never leave them on, for they are regular in uncleanness.
Pirkei Avot
Rabbi Tarfon said: the day is short, and the work is plentiful, and the laborers are indolent, and the reward is great, and the master of the house is insistent.
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