Explore every episode of the podcast Sleep Science Explained: What Happens After You Close Your Eyes

At night, the room becomes quiet, but your body does not clock out. Inside this episode: - Rest Does Not Mean Inactive - The Heart Changes Gears - Breathing Continues Automatically - Hormones Keep Time - Metabolism Never Stops Sources include the references linked below. Sources and further reading: - [NHLBI, Why Is Sleep Important?](https://www.nhlbi.nih.gov/health/sleep/why-sleep-important) - [NINDS, Understanding Sleep](https://www.ninds.nih.gov/sites/default/files/2025-05/understanding-sleep.pdf) This episode provides general education about sleep and the body. It is not medical advice, diagnosis, treatment, or an assessment of any listener. Follow Sleep Science Explained for another clear look at what happens after you close your eyes.

In a dream, a school hallway may open into a train station. A person you have not seen for years may speak with your neighbor's voice. The change feels ordinary until you wake. Inside this episode: - Everyone Dreams - Rem, The Famous Dream Stage - The Body Becomes Still - An Active Brain With Changed Priorities - Where The Material Comes From Sources include the references linked below. Sources and further reading: - [NINDS, Understanding Sleep](https://www.ninds.nih.gov/sites/default/files/2025-05/understanding-sleep.pdf) - [NHLBI, Sleep Phases and Stages](https://www.nhlbi.nih.gov/health/sleep/stages-of-sleep) This episode provides general education about sleep and the body. It is not medical advice, diagnosis, treatment, or an assessment of any listener. Follow Sleep Science Explained for another clear look at what happens after you close your eyes.

Close your eyes at night, and it may feel as if consciousness simply fades and returns in the morning. Inside your brain and body, the journey is much more active. Inside this episode: - How Do We Know A Stage Exists? - The Two Forces That Bring Sleep - N1, The Threshold - N2, Clearly Asleep - N3, Deep Slow-Wave Sleep Sources include the references linked below. Sources and further reading: - [NHLBI, Sleep Phases and Stages](https://www.nhlbi.nih.gov/health/sleep/stages-of-sleep) - [NINDS, Understanding Sleep](https://www.ninds.nih.gov/sites/default/files/2025-05/understanding-sleep.pdf) This episode provides general education about sleep and the body. It is not medical advice, diagnosis, treatment, or an assessment of any listener. Follow Sleep Science Explained for another clear look at what happens after you close your eyes.

Place a person in a quiet room with no clock, and the body does not lose all sense of time. Temperature rises and falls. Hormones change. Inside this episode: - A Rhythm Close To One Day - The Master Clock - Light Takes A Special Route - Melatonin Is A Time Signal - Clocks Throughout The Body Sources include the references linked below. Sources and further reading: - [NHLBI, Your Sleep and Wake Cycle](https://www.nhlbi.nih.gov/health/sleep/sleep-wake-cycle) - [NIGMS, Circadian Rhythms](https://www.nigms.nih.gov/education/fact-sheets/Pages/circadian-rhythms) This episode provides general education about sleep and the body. It is not medical advice, diagnosis, treatment, or an assessment of any listener. Follow Sleep Science Explained for another clear look at what happens after you close your eyes.