You Die Every Night: Sleep and the Soul in Surah Az-Zumar 39:42

Every night, millions of people close their eyes without a second thought. Yet the Quran describes sleep in words that should make us pause: sleep is a kind of 'taking' of the soul, a small rehearsal of death that happens every single night, until the night when the soul is not sent back.

What the Quran says

In Surah Az-Zumar 39:42 Allah says that He takes the souls at the time of their death, and the souls of those who have not died during their sleep. Then He keeps the ones for whom He has decreed death and sends the others back until a set term. The verse ends: 'Indeed in that are signs for a people who give thought.'

Surah Al-An'am 6:60 says the same from another angle: 'It is He who takes your souls by night and knows what you have committed by day, then He raises you up therein so that a specified term may be fulfilled.' The verb in both verses is from tawaffā, the same word used for death. Every night the soul is taken; some are held back, and the rest are returned at dawn.

The Sunnah of sleeping and waking

The Prophet ﷺ taught us to remember this reality twice a day. Before sleeping: 'Bismika Allahumma amutu wa ahya' (O Allah, in Your name I die and I live). On waking: 'Alhamdu lillahil-ladhi ahyana ba'da ma amatana wa ilayhin-nushur' (All praise is for Allah who gave us life after He caused us to die, and to Him is the return). Both are recorded in Sahih al-Bukhari (6312). Waking up each morning is, in this sense, a new gift of life.

What science can measure

Sleep science shows that sleep is far from 'switching off'. During the night we pass through four to six cycles of about ninety minutes. In deep sleep the brain produces slow delta waves, the heart and breathing slow down, and body temperature reaches its lowest point before dawn. In REM sleep most muscles are temporarily paralysed while the eyes move quickly. A study in mice found that the brain clears waste such as beta-amyloid much faster during sleep. You can read more about these stages in our companion article, Sleep or Death?

Where the link stops

The Quran describes sleep as a taking of the soul, a spiritual reality. Science can measure the body during sleep, its brain waves, heartbeat and muscles, but it cannot measure the soul. How consciousness switches off and returns is still an open question in science. So this is reflection (tadabbur), not a claim of scientific proof. And the reflection is powerful on its own: each night is a reminder of death, and each morning a reason for gratitude.

Practical lessons

• Say the Sunnah dua before you sleep and when you wake.
• Sleep with wudu and settle your affairs; nobody knows which night the soul will be held back.
• Thank Allah each morning for another day to do good.
• Respect sleep as a blessing: it restores the body that Allah has entrusted to you.