I have something a bit different this week.
Over the last seven episodes I’ve been laying out the framework — circadian biology, meal timing, light, hormones, why the body works the way it does. And somewhere along the way, questions started coming in. From the newsletter, from Substack, from people who’d been listening and thinking and wondering things they hadn’t had answered properly.
Some of them were really great questions I wouldn’t have come up with myself.
So this week’s podcast episode is a Q&A — twelve questions, answered honestly. And this newsletter is the written version: shorter answers here, but enough to be useful on their own. If any of them spark your curiosity, the full answer is in the episode.
“I’ve been getting morning light for three weeks. I don’t feel any different. Am I doing something wrong?”
Probably not. Three weeks is genuinely not very long when you’re trying to re-entrain a circadian system that’s been out of rhythm for years. The first thing that tends to shift is sleep - subtly, not dramatically. Then mood. Then energy. Most people don’t notice real changes until weeks four to eight, and even then it’s more like a floor rising than a sudden improvement.
That said, it’s worth checking a few things: are you going outside, or doing it through a window? (Glass filters the wavelengths your photoreceptors need - window doesn’t really count.) Are you out for at least twenty minutes? Within an hour of waking? And what are you doing in the evenings? Morning light working against bright screens and late eating is like swimming upstream.
→ Audit the basics first. Then look at the evenings - morning work is often undone after dark.
“What if I wake up before sunrise in winter? Should I use a light box?”
Maybe - but with caveats. Light boxes work by stimulating the same photoreceptors that respond to outdoor morning light. You need 10,000 lux, you need to sit fairly close (within about 12–18 inches), and it needs to be facing you. You could set it up on the kitchen table during breakfast, for example.
But a light box doesn’t replicate the full spectrum of natural daylight - it’s a useful supplement, not a replacement. Once the sun is up, even briefly, even in the rain, get outside. Outdoor light on a grey winter morning is still ten to a hundred times brighter than any indoor light source. Your photoreceptors don’t need blue sky. They just need outdoor.
→ Light box during breakfast, outside once the sun’s up - even five minutes in the drizzle counts.
“Does morning light have to be outside, or can I get it through a window?”
Outside. Standard glass filters out a significant proportion of the UV and blue-spectrum wavelengths your body clock needs. Depending on the glass, you might be getting as little as five to ten percent of the signal you’d get standing in the same spot outside. Sitting next to a very bright window is not the same thing.
I know. In winter in northern climates this requires a specific kind of commitment. I have stood in my garden at 7am in what I can only describe as hostile weather, holding a mug of tea, waiting for the 20 minutes to be up. But the 10-20 minutes outside beats an hour next to a window. Every time.
→ Outside. Even standing on your doorstep counts. Even briefly. Even in a coat.
“I have young kids who wake me unpredictably. How do I manage circadian rhythm when my mornings are chaos?”
I tend to think of the minimum effective dose here. Perfect circadian alignment is not always available to parents of young children, and feeling guilty about that is a waste of the energy you’re trying to protect. The school run counts. Walking to the car and standing outside for an extra two minutes counts. A light box during breakfast (for you and for them) also counts to some extent.
The one thing worth prioritising if you can: a consistent wake time. The research on irregular wake times is clear that weekend lie-ins can compound the problem. Holding a reasonably consistent wake time - even within a forty-five minute window - anchors the whole system more than extra sleep does.
→ Progress, not perfection. School run counts. Consistent wake time matters more than extra weekend sleep.
“I’m never hungry in the morning. Do I have to eat breakfast?”
Not being hungry in the morning is a signal, not a preference. In most women with disrupted energy and metabolic rhythm, it means hunger signalling is off — ghrelin and leptin, the hormones that regulate appetite, follow a daily rhythm that’s been disrupted. The result: you wake up not hungry, skip breakfast, cortisol climbs higher through the morning trying to maintain blood sugar, you feel wired and slightly anxious, crash at eleven, eat something quick. Which makes the afternoon worse. Which affects sleep. Which makes the next morning worse.
The fix isn’t forcing yourself to eat a full breakfast immediately. It’s starting small - a couple of eggs, some Greek yoghurt - with protein and fat rather than carbohydrate. Done consistently, morning hunger tends to return within two to three weeks. Your body starts to expect food in the morning. That’s a good sign.
→ Start small, protein first, do it consistently. Morning hunger usually comes back within a few weeks.
“What about intermittent fasting? You say eat breakfast, but IF says skip it.”
Intermittent fasting works. The big reason it works is that it aligns your eating window with your circadian rhythm - it’s not just the fasting doing the magic, it’s the timing. The problem is that most people do IF by skipping breakfast and eating until 8pm, which is metabolically backwards. You’re fasting during the part of the day when your body most wants fuel, and eating during the part when it’s trying to wind down.
For women - and particularly for women in perimenopause - a gentler approach tends to work better. A twelve to fourteen hour eating window, with eating earlier rather than later. Finish dinner by seven or eight in the evening, eat your first meal within an hour of waking. That gives you the benefits of a fasting window without the cortisol spike that prolonged morning fasting can trigger.
→ Focus on when the window is, not just how long. Eat earlier, not less. A 12–14 hour window is plenty.
“I’m in perimenopause. Will any of this actually work for me, or is it too late?”
It’s not too late. And I’d argue this work matters more in perimenopause, not less. Oestrogen directly stabilises the master body clock — it interacts with circadian biology at a biological level. When oestrogen starts declining, the circadian system becomes genuinely less stable. Which is why everything seems to go wrong at once: sleep, weight, energy, mood, temperature regulation. It’s not you falling apart. It’s your biological clock losing its stabiliser.
The interventions that strengthen circadian rhythm - morning light, consistent meal timing, managing evening light - compensate for exactly that gap. Your cells still respond to these inputs. Your master clock still responds to light. You’re not past the point where this matters. You’re at exactly the point where it’s most needed.
→ Perimenopause makes circadian work more important, not less relevant. Start with morning light and consistent meal timing. Give it eight weeks.
“How long before I see results? Give me a realistic timeline.”
Weeks 1–2: sleep shifts first. Subtle - you might fall asleep more easily, wake less at 3am. Not the thing you were hoping for, but it’s the first sign the system is responding.
Weeks 2–4: mood steadies before energy does. Less reactive, less evening despair.
Weeks 4–8: energy floor rises. The 3pm crash gets less catastrophic. You notice you didn’t reach for the third coffee.
Weeks 8–16: the more significant shifts. Better hormonal balance, clearer thinking, sleep that actually restores. This is when women say “I feel like myself again” - and mean it. These timelines assume consistency. The circadian system responds to pattern, not intention.
→ Sleep first. Mood next. Energy after that. Deeper shifts at 8–16 weeks. Measure month to month, not day to day.
“What’s the one thing I should focus on first if I’m just starting out?”
Morning light. I keep coming back to it because it’s the single input with the most downstream effects. When you go outside within an hour of waking, for at least twenty minutes, you trigger your cortisol awakening response at the right time. You tell your master body clock what time it is. And once the clock knows what time it is, it organises everything else — cortisol, melatonin, blood sugar regulation, hunger hormones.
It’s not magic. It’s biology. But it’s where to start. Get this habit solid for four weeks before you add anything else.
→ Outside, within an hour of waking, at least twenty minutes, every day. Before your phone. Before email. Before anything else.
“Should I be worried about EMFs?”
I would say don’t panic, but be thoughtful. The research on non-native EMFs and health is still developing - we don’t have the settled evidence we have for morning light and circadian rhythm. What exists suggests potential biological effects from prolonged, high-intensity exposure. The honest answer is we don’t have great long-term data on cumulative low-level exposure, which is a reason for reasonable caution rather than certainty either way.
Practical steps that cost nothing and are probably worth doing: phone out of the bedroom at night, wi-fi router off overnight (a simple timer switch, a few euros), wired earphones for long calls. Small changes, low effort, part of a broader picture of reducing unnecessary modern environmental stressors.
→ Don’t panic. Phone out of the bedroom. Wi-fi off at night. Wired earphones for long calls.
“I eat really well and exercise regularly. Why am I still exhausted?”
This is the question that sits at the heart of what I do. Food quality and exercise matter enormously, but they’re two inputs into a system with several others. What I see constantly is women doing the diet and the exercise really well and still feeling terrible. And the conclusion they’ve reached, quietly, is that something must be fundamentally wrong with them.
Your mitochondria (the structures in your cells that produce energy) don’t just respond to what you eat. They respond to light signals, to whether your nervous system perceives safety or threat, to the time of day. When those signals are off — eating well but at the wrong times, exercising in a state of chronic stress, no morning light and bright screens until midnight — cellular energy production is compromised regardless of how clean your diet is. It’s like having a good car with quality fuel but driving in the wrong gear.
→ Good food and exercise are necessary but not sufficient. Add the circadian layer — morning light, meal timing, evening light — and see what changes.
“Is it normal to feel worse before you feel better when you start making changes?”
Yes. When you start shifting your circadian rhythm — eating earlier, getting morning light, cutting back on evening screens — you’re essentially moving your body clock. There’s often a transition period: more tired for a few days as sleep pressure readjusts, hungrier at unfamiliar times, a flatness in the evenings if you’ve been running on a cortisol-driven second wind. This is not your body rejecting the change. It’s adjusting. Adjustment discomfort usually passes within one to two weeks.
One thing that helps: don’t change everything at once. One new habit, properly bedded in, is worth more than six done inconsistently. Start with morning light. Get it solid. Then add meal timing. Sequential is kinder to the system and more likely to stick.
→ A brief transition period is normal. If it passes within two weeks, you’re adjusting. Change one thing at a time.
That’s the written version. If any of those answers raised more questions than they answered — or if you want the full version of any of them — it’s all in Episode 8.
And if you’ve got a question that wasn’t in here, drop it in the comments. I’m already collecting for the next round.
Frances
P.S.
If you want to see how all of this fits together — the full four-pillar picture, in one place, with the sequencing — the free masterclass is at francesnorgate.com/masterclass.
