The New Science of Your Body Clock
OUR TAKE
Most conversations about energy focus on what you do — exercise, diet, sleep duration. Dr Kristen Holmes shifts the focus to when you do it. She's a scientist who studies human performance at scale, and her central argument is simple and slightly alarming: most of us are living out of sync with our own biology, and it's costing us more than we realise.
KEY IDEAS
① Your body clock controls far more than sleep Circadian rhythms govern your immune function, metabolic health, mood, and cognitive performance. Disrupting them doesn't just make you tired — it has measurable consequences across almost every system in your body.
② Consistency of timing matters more than duration Going to bed and waking at the same time every day — including weekends — is one of the highest-leverage changes you can make. The weekend lie-in isn't the recovery it feels like.
③ Morning light is your most powerful daily reset Getting outside within the first hour of waking, even on cloudy days, anchors your circadian rhythm and has downstream effects on energy, mood, and sleep quality that night.
④ When you eat is as important as what you eat Eating late at night forces your body to run digestive processes during what should be its rest phase. Holmes explains how meal timing directly affects your metabolic health and recovery.
⑤ Alcohol disrupts your circadian rhythm, not just your sleep Even moderate alcohol consumption interferes with the body's internal clock in ways that go beyond poor sleep quality — affecting next-day energy, immune response, and emotional regulation.
LISTEN TO THIS IF…
You feel tired despite sleeping enough hours
Your energy is inconsistent or crashes in the afternoon
You want the science behind why your routine matters
You're trying to build morning or evening habits that actually stick
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