Feel Better, Live More with Dr Rangan Chatterjee BITESIZE | How to Sleep Better, Get More Energy & Improve Your Mental Wellbeing | Dr Kristen Holmes #655
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May 7, 2026 
Dr Kristen Holmes, WHOOP’s Global Head of Human Performance and circadian scientist, shares data-driven tips to harmonize body clocks. She discusses how night light and late meals harm sleep and recovery. Practical fixes include consistent wake times, morning light, and family-friendly evening swaps. The clip focuses on simple rhythm-resetting strategies to boost energy and wellbeing.
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Night Light Kills Next Day Motivation
- Viewing light between 11pm and 4am blunts the dopaminergic motivation and reward systems, reducing focus and drive the next day.
- Kristen Holmes cites a 2017 paper and WHOOP data showing chronic night light exposure confuses the brain's control center and stresses body clocks.
Match Your Daily Rhythm To Natural Light Dark Cycle
- Align key daily behaviours—light exposure, meal timing, activity and socialising—with the natural light–dark cycle.
- Holmes notes modern 24/7 access to light and food creates stress by allowing activity at biologically inappropriate times.
Set Your Day By A Consistent Wake And Morning Light
- Wake at the same time every day and immediately get 5–10 minutes of outdoor natural light to set your circadian rhythm.
- Consistent wake-time is more important than occasional extra sleep because it times melatonin drop and sleep readiness.