According to Osho, there is no separate 'sleep chakra.' Each of the first six chakras has a sleep-and-wake phase (yin/yang), while the seventh, Sahasrar, is pure awareness and never sleeps; hence the yogi never sleeps though body and mind do. As energy rises through higher centers, sleep becomes deeper, quieter, and more relaxed.
There isn’t one sleep chakra; each lower chakra has a sleep/wake side, while the top chakra stays aware even when the body sleeps.
From the Discourses
Passages where Osho speaks to this question — each links to the complete discourse.
Is there a sleep chakra too?
Each chakra has a sleep part, except the last -- the SAHASRAR. At the seventh chakra, awareness is total: it is pure awareness. That's why Krishna says in the Gita: The yogi never sleeps. "The yogi" means one who has come to the last center of his being, to the ultimate flowering; one who has become a lotus. He never sleeps. His body sleeps, his mind sleeps: he never sleeps. Even when a Buddha is sleeping, deep in the innermost core of his being a light goes on burning bright. The seventh chakra has no sleep part to it, otherwise all the six chakras have both: yin, yang. Sometimes they sleep and sometimes they are awake: day, night -- they have both aspects. When you feel hungry, the center for hunger is awake. If you have ever tried fasting, you would be surprised. If you try fasting, then for two,…
So it is centered on different chakras. The bliss of the soul that becomes available is concentrated differently on different chakras.
And when you pass through all seven centers—seven centers. Understand that the sex center is number two; it is not number one. Sex is center number two. From there you can also descend to center number one; if you go below it, you fall into coma, into unconsciousness. Below that, there is no consciousness. Plants live there, stones live there, animals and birds live there. They live at the center one below the sex center. They sometimes come up to sex, but then they fall back to their own center below. That is why sex in animals and birds is periodic; in man it is not periodic. The only reason is this: pushed by seasons and nature, they somehow manage to reach up to sex; when their work is done, they fall back to the lower center. Some people say, “The animal is better than man.” No “better” or “worse”…
All humanity is miserly. The cause of miserliness is the feeling: it will be used up. What you have is so little that you are afraid. You try to save it. And there is a very complex thing here: the more you try to save, the more the process of your six chakras slows. For when there is no need—when you share, need is created. When need is created, the chakras turn, drawing more energy. When there is no need, the wheels become still, they rust; they cease to move. The miser becomes weak. None is weaker than a miser. The greedy becomes weak. The giver expands. The greedy shrivels. It is like a well: if you draw water daily, there are springs beneath; from those springs new water keeps coming. New streams open up. You keep drawing; the well keeps filling. Its bottom remains the same.
Osho, do the chakras accompany the subtle body or not?
Chakras? Yes. If we understand closely, chakras are the fields of contact between the subtle body and this gross body. Wherever your gross body and that subtle body touch, those points are chakras. So they are the same in everyone; there is no difference— in all creatures, in everyone. Wherever the body is touched—even in a cow—there a chakra will form. And those touching sites are fixed. For example, understand that at the sex center there will be a chakra. Whether the being is of any species—a dog, a cat, a man, a woman—it makes no difference; there will be a very forceful chakra at the sex center. So that chakra will be present in all bodies; whatever their form, there will be a chakra at that place. Yes, that chakra may be smaller or larger, weaker or stronger. “Are there seven chakras?” Yes, there will be seven chakras. (Question…
When your whole heart is moved by love, Tejo leshya is born in your life. But remember: Mahavira still calls it a leshya. He says, that too is a bondage—righteous, true, beautiful, yet do not forget it binds. Then comes Padma leshya and Shukla leshya. Life grows ever more beautiful. Shukla leshya—the yogic third eye, the tantric Shiva eye—this is Mahavira’s Shukla leshya. Between these six within you is the difference of new moon and full moon. When your life energy comes to rest at the ajna chakra, your entire inner sky is crowned with a radiance. A light spreads. For the first time you are awake. For the first time you attain to meditation. Hence Patanjali called it the ajna chakra. Ajna means: in this moment, what you command is fulfilled. Your command is naturally accepted by your personality.