What happens when we sleep?

Sleep Physiology, Animation

6 tips for better sleep | Sleeping with Science, a TED series

DEEPER SLEEP💤 @IM8Health is part of my nightly ritual. Because sleep doesn’t start with the lights off— It starts with the nervous system. 4-7-8 Breathing slows the heart, regulates CO₂, and increases vagal tone. It shifts you out of “fight or flight” and into true recovery. Inhale for 4. Hold for 7. Exhale for 8. Repeat for 3–5 minutes. This breath protocol increases melatonin, drops cortisol, and calms the amygdala. It’s used by functional medicine doctors, trauma therapists, and elite perfor

Sleep Stages, Sleep Cycle, and the Biology of Sleep

How Does Sleep Work and WHY Do We Need It?

How does sleep work? - Introduction, Physiology, EEG, Circadian Rhythm & Stages of Sleep