The Right Amount of Sleep

G-d created the human body in such a way that it requires rest, and cannot function properly without a significant period of sleep each night. In His infinite wisdom, G-d determined that it is preferable for human beings not to have the ability to continuously work and tend to their affairs without ever resting. One explanation for this decision is that Hashem mercifully granted us the opportunity to "reset" after a difficult, challenging or upsetting day. When a person feels disappointed or pained, a good night's sleep allows him to begin fresh the next morning, to experience a new start, so that the failures or misfortunes of the previous day no longer discourage him and he can approach the new day with vigor and positivity. Another explanation is that the person's Neshama (soul) receives an "upgrade" every night when he sleeps. During sleep, Hashem cleanses the soul and returns it in the morning in better condition than it had been when the person went to sleep. We might say that we have our souls "serviced" every night, and this is the great benefit of sleep. The Ben Ish Hai (Rav Yosef Haim of Baghdad, 1833-1909) writes that it is a mistake to think that sleeping is always beneficial for the body. Sleeping excessively, more than the body needs, is actually detrimental to one's health. This has been confirmed by modern medicine. Therefore, one should sleep only as much as he needs and no more. Of course, one must also ensure not to sleep less than the body needs in order maintain its strength. But after one sleeps a reasonable amount, he should use the rest of his time for Torah study. The Ben Ish Hai also writes that there are certain times when it is recommended to stay up late learning Torah – such as on Thursday nights, the night before Rosh Hodesh, during Elul and the Aseret Yemeh Teshuba, and during the weeks of Shobabim in the winter. Some people sleep only four-and-a-half or five hours a night on these occasions, and the Ben Ish Hai writes that the extra time devoted to the soul compensates for the lost time of sleep. The Rambam taught that one should sleep eight hours a night in order to maintain his physical wellbeing. He should then spend eight hours working for a living, and the other eight hours learning Torah. Some found an allusion to this concept in the verse in Iyob (3:13), "Yashanti Az Yanu'ah Li" ("I have slept, and then I experience rest"). The word "Az" in Gematria equals 8, and thus "Yashanti Az" subtly refers to the eight hours that one should sleep each night. Another allusion is the passage in our Shabbat prayers, "Az Tasliah Et Derachecha" ("Then shall you succeed in your paths"), indicating that sleeping "Az" – eight hours – brings success. There were great Sages who slept less than eight hours. The Vilna Gaon (1720-1797), for example, is said to have slept only two hours a night. And Rav Zalman of Volozhin (1752-1799)– one of the Vilna Gaon's most illustrious disciples – slept just fours a night. It is told that Rav Zalman was once asked about the verse, "Yashanti Az Yanu'ah Li," which alludes to eight hours of sleep, and he replied that the world "Li" at the end of the verse in Gematria equals 40. This verse thus instructs that one should sleep eight hours out of every forty-eight hours, or four hours a night… The Tiferet Yisrael (Rav Yisrael Lifshitz, Germany, 1782-1860) distinguished between different ages, stating that until the age of 50, when people are generally more physically active, one should sleep eight hours each night, whereas after 50, less sleep is needed. In any event, it is generally accepted that most people should sleep between six and eight hours a night. The most important thing is to use one's time constructively the rest of the day. When we look at our daily schedules, we will find that many of us sleep less than the eight hours recommended by the Rambam, and yet most of us fail to learn even close to the eight hours that he urges us to learn. It is true that much of our time is spent working, commuting, and tending to our families. Unfortunately, however, much of the other time is being consumed by vanity and wasteful pursuits, particularly screentime. It is critically important for us to refrain from wasting time, to make sure to get enough sleep and to care for our physical wellbeing, but to use the rest of the time as constructively as possible.

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The Right Amount of Sleep is an episode from Daily Halacha Podcast - Daily Halacha By Rabbi Eli J. Mansour by Torah Learning Resources..

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This episode was published on Apr 30, 2026.

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