Your Body Clock Isn’t Broken: A Beginner’s Guide to Circadian Rhythm
“I’m just not a morning person.”
“I’ve always been a terrible sleeper.”
“My body clock is all over the place.”
Over many years of running retreats, teaching courses and coaching, I’ve heard these words more times than I can count, and I understand them completely. What I notice is that when you’re dragging yourself out of bed on your third alarm or lying wide awake at midnight, it’s very easy to decide that something inside you is broken.
But what if it isn’t broken at all? What if it’s simply out of sync?
Meet your body clock
Deep in your brain sits a tiny area called the suprachiasmatic nucleus. It’s your master clock, and it helps set a roughly 24-hour rhythm for your sleep, alertness, body temperature, hormones and even your appetite. This daily cycle is called your circadian rhythm.
Here’s a detail I find fascinating. According to the Sleep Foundation, the body’s internal clock runs on a cycle that’s slightly longer than 24 hours. That means it needs a little nudge every single day to stay aligned with the world around us.
And the most powerful nudge of all? Light.
Light: your clock’s daily reset button
Light and darkness are the strongest signals your body clock receives. As evening falls and light fades, your body releases more melatonin, the hormone that helps you feel sleepy. Morning light switches melatonin production off and tells your body it’s time to be alert.
The trouble is, modern life sends some very mixed messages:
- Dim mornings. We often go from a dark bedroom to a dim kitchen to a car or office, missing the bright light our clock needs.
- Bright evenings. Screens and bright overhead lights late at night can delay melatonin and push our clock later.
- Shifting schedules. Late nights at the weekend followed by early Monday alarms can feel a lot like jet lag, without the holiday.
So often, the problem isn’t your body. It’s the signals your body is receiving.
Larks, owls and everyone in between
Of course, we’re not all built the same. Some people naturally feel brightest early in the day (the larks), while others come alive later (the owls). Most of us sit somewhere in the middle. This natural leaning is called your chronotype, and it’s shaped partly by your genes and partly by your age. Teenagers, for example, tend to shift later, while many of us drift earlier as we get older.
Your chronotype isn’t a flaw to fix. It’s useful information. When you know it, you can work with your natural rhythm rather than battling against it every morning.
Try this: a one-week light and timing diary
For the next seven days, keep a simple note each day. No judgement, just curiosity.
- Wake time: When did you wake, and how did you feel?
- Morning light: Did you get outside, or sit by a bright window, within an hour of waking? For how long?
- Energy dips: When did you feel most alert, and when did you flag?
- Evening light: When did screens go off and lights go down?
- Sleep time: When did you feel sleepy, and when did you actually go to bed?
At the end of the week, look for patterns. Many people are surprised by how closely their best nights follow their brightest mornings.
If you’d like a small experiment for week two, try just one change: ten to fifteen minutes of daylight soon after waking, every day, even when it’s cloudy.
Coach’s Corner
When a client says they “can’t sleep”, it’s tempting to jump straight to bedtime tips. A timing diary like this often reveals far more. It helps clients see their own patterns, and those insights tend to motivate change far more than advice ever could.
A question to sit with
Are you a lark, an owl, or somewhere in between, and how well does your current routine honour that?
Your next step
Understanding your body clock is one of the foundations of our Sleep Well Coach Training. This self-paced course explores sleep through daily rhythms, light exposure, routines and how stress is carried through the body, and includes a fully mapped-out 28-day client coaching programme. On completion you’ll receive a certificate for 40 CPD hours from the Association for Coaching, something to be proud of. Whether you’re here to sleep better yourself or to help others, it all starts with understanding the rhythm you already have.
