We all do it, usually for about a third of our lives. But what's going on when we drift off?

Our sages pondered this deeply. In Bereshit Rabbah, a collection of rabbinic commentaries on the Book of Genesis, they unpack the verse "The Lord God cast a deep slumber upon the man, and he slept. He took one of his sides, and He closed it with flesh in its place" (Genesis 2:21). It's not just about Adam falling asleep, it’s about the nature of sleep itself.

Rabbi Yehoshua of Sikhnin, quoting Rabbi Levi, makes a pretty strong statement: "The beginning of downfall [mapala] is sleep!" Why such a dramatic claim? Well, when we sleep, we're not engaging with Torah, we're not working. In other words, we're not actively participating in the world. Too much sleep, they warn, is a “recipe for ruin.” The Hebrew word used here, hipil, literally means "He caused to fall down." It's a powerful image.

Rav takes this idea further, categorizing different kinds of slumber. He identifies three distinct types: the slumber of sleep, the slumber of prophecy, and the slumber of a trance. The slumber of sleep is the everyday kind, like the one Adam experienced. The slumber of prophecy? We see that in Genesis 15:12: "It was when the sun was setting, and a deep slumber fell upon Abram." And then there's the slumber of a trance, exemplified in I Samuel 26:12, where "No one saw, and no one knew, and no one awoke, as they were all asleep, because a deep slumber from the Lord had fallen upon them."

But wait, there's more! The Rabbis add a fourth type: the slumber of foolishness. As Isaiah 29:10 puts it, "For the Lord poured upon you a spirit of deep slumber." This isn't just physical sleep, but a kind of spiritual blindness.

Rabbi Ḥanina bar Yitzḥak offers another fascinating perspective. He says there are three microcosms – miniature versions – of larger realities. Sleep, he says, is a microcosm of death. A dream is a microcosm of prophecy. And Shabbat, the Sabbath, is a microcosm of the World to Come. Think about that for a moment. Sleep, a little death. Dreams, glimpses into the divine. Shabbat, a taste of eternal peace.

Rabbi Avin adds two more microcosms to the list: the orb of the sun as a microcosm of supernal light, and Torah as a microcosm of supernal wisdom. The sun, a small reflection of the ultimate light. Torah, a pathway into the ultimate wisdom.

So, what does all this mean? It seems our sages are inviting us to see sleep as more than just a biological necessity. It's a complex state with different levels and meanings, a mirror reflecting deeper truths about ourselves and the universe. It's a reminder of our limitations, our potential for divine connection, and the promise of a future world. Next time you drift off, consider what kind of slumber you're entering. Maybe, just maybe, you'll wake up with a little more wisdom.