Essentials: Sleep Toolkit for Optimizing Sleep & Sleep-Wake Timing

Key takeaways

• Cut caffeine hard after 4 PM: Limit intake to no more than 100 milligrams of caffeine past 4 PM. Andrew Huberman warns that ignoring this will disrupt your sleep architecture and delay your ability to fall asleep at a reasonable hour. Read more →
• The first 30-60 minutes after waking are critical for light exposure, ideally from sunlight, to trigger cortisol and suppress melatonin. This sets a precise 16-hour countdown to sleep. Read more →
• Between 10 p.m. and 4 a.m., aggressively dim or eliminate bright overhead artificial lights to avoid scrambling your circadian rhythm. Read more →
• Andrew Huberman suggests a specific "sleep stack" for individuals who have already optimized their sleep hygiene but still struggle to fall and stay asleep. This is a final optimization, not a first step. Read more →
• Your body reaches its lowest temperature, the "temperature minimum," approximately two hours before your usual wake-up time. Read more →