You wake up. Your feet have not even touched the floor yet, and already a voice sounds in your head. Not your own voice — that of a book, a video, a coach you once heard. Make your bed first. Begin the day with a finished task. That is how you build discipline.

I knew that voice well. I followed it for years. And I passed it on to my children, every morning anew: come on, make your bed, it gives you something to hold on to. I believed it sincerely. Until something small began to gnaw at me.

The book that became a worldwide habit

The idea comes largely from a little book by Admiral William H. McRaven: Make Your Bed. It grew out of a commencement speech, and its core is lovely. McRaven says: if you finish one task well in the morning, you give yourself a small sense of pride. That first finished thing invites the next. And should your day go badly, you come home to a made bed — proof that tomorrow begins again.

Read it carefully, because here lies the misunderstanding I made myself. The book is not about hygiene. It is about discipline and self-worth. The made bed is a metaphor.

And yet millions of people — me included — began to take the metaphor literally. We made the bed. Straight away. Tight. Tucked in. As if the tightness itself were the goal.

The penny dropped because of my son

What shook me awake was not a study. It was my son.

His hay-fever-like complaints were increasing. Sneezing, a blocked, tickly nose, especially around his bed and his bedroom. At first I thought of pollen, of the season. But the pattern did not quite fit. And then I went to look — really look — at what we did every morning.

We got up out of a warm, damp bed. And within a minute we pulled it shut. Duvet over the top, sheets smooth, everything sealed. We were not making a bed. We were making a greenhouse.

A little science, calmly explained

In almost every bed in the world lives a creature you cannot see: the house dust mite. A microscopically small, spider-like little being. It does not bite, does not sting, carries no disease. It only eats the dead flakes of skin we shed all day long. The Dutch Lung Foundation (Longfonds) puts it honestly: however often you clean, it lives in every home.

The problem is not the creature itself. It is its droppings. They waft up, you breathe them in, and in people sensitive to them this produces precisely the complaints I saw in my son: itching, sneezing, a runny or blocked nose, sometimes tightness of breath.

Now comes the part that explains everything. The house dust mite has no mouth to drink with. It takes up water from the air, straight through its skin, a little like a sponge drawing moisture from a damp room. That is why it needs humid air to live. Dutch hospital information leaflets set out the limits neatly: above roughly 45% humidity it survives, from about 55% it reproduces, and at 70 to 80% moisture with a temperature of 20 to 30 degrees it grows fastest of all.

Read those numbers again. And then think of a bed just left behind. Warm from your body. Damp from the night. And then you pull it shut and seal in that warmth and that moisture. You have, without knowing it, built exactly the climate this little creature dreams of.

Here I keep myself — and you — honest

Because this is how this blog works: I do not tell you only what happens to suit me.

You often hear that at night we “lose a litre of moisture into the mattress”. That is not quite right. The figure is disputed. During normal sleep, in an ordinary bedroom, the loss is probably much smaller — and a good part of it leaves your body through your breath, as water vapour into the air, not as sweat into your mattress. So no, your mattress does not soak up a litre overnight. But warm and more humid than the room air? That it is, in the morning. And that is enough.

There is also a well-known study — from a British research team, often linked to Dr Stephen Pretlove of Kingston University — frequently quoted with the headline: leave your bed unmade and you kill the mites. Honesty is honesty: that was a computer model, not a clinical study in patients, and it has only partly been reproduced by others. Other allergy specialists immediately raised questions about it — in many homes the air is humid enough anyway, they said, so simply not making your bed is no magic wand.

I think you should know that. Not because it makes my story weaker, but because it makes it stronger. Because look at what remains when you strike out all the exaggeration: the biology is certain (mites need moisture), and the official advice is clear. The Lung Foundation and Dutch respiratory nurses do not say “never make your bed”. They say: ventilate, day and night, and air your bedding. Keep the humidity around 50%. Throw the bed open, let the sheets and duvet breathe. Wash bedding at 60 degrees. That is not hype. That is the standard.

And that is exactly what I did. Not pull it shut at once, but first throw it open and air it. My son’s complaints decreased considerably. One change. So small.

What this is really about

Here it touches the deeper layer, and I want to take you with me into it.

I did not disagree with McRaven. I had only misunderstood him. His book is about discipline, and I thought discipline meant: find a rule and repeat it faithfully, unchangeably, blindly. Tighter, neater, earlier.

But that is not discipline. That is obedience.

Real discipline begins one step earlier. Not with making up the bed, but with noticing. It is the willingness to stay awake to what reality shows you, even when that reality is a coughing son telling you that your lovely morning ritual is making him ill. Discipline without noticing becomes a cage. Discipline with noticing becomes a way out.

And you do not have to choose. I still make the bed — McRaven gets his finished task, his small sense of order. I just do it later in the day, after the bed has been able to air. The discipline remains. So does my child’s breathing.

That, for me, is the real lesson, and it reaches much further than a bed. How many rules do we carry with us, only because everyone repeats them? How many “this is how it is done” have we never tested against our own life, our own body, our own child?

One last, important note: this is my story and general, publicly available advice — not medical advice. Do you or your child have persistent allergy or breathing complaints? Then go to your GP. They can, if needed, refer you for genuinely tailored advice. My experience does not replace your doctor.

So carry this question with you today:

Which rule do you follow faithfully — because it works? Or because you have never dared to notice that it might no longer suit you?

Related reading

• Tomorrow at 7 PM
• The Desire Path in Your Mind
• Yesterday Is History: The Science of Letting Go
• You Are What You Repeatedly Do

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Sources

• Longfonds (Dutch Lung Foundation) — House dust mite and Healthy air: what can I do? (advice on continuous ventilation, airing bedding, humidity).
• Dutch hospital leaflets on house dust mite allergy (incl. HagaZiekenhuis, Anna Ziekenhuis, Nij Smellinghe): survival and reproduction thresholds at ~45% and ~55% humidity, optimum at 20–30 °C and 70–80% moisture; washing at 60 °C; target humidity around 50%.
• Crowther, D., Wilkinson, T., Biddulph, P., Oreszczyn, T., Pretlove, S., & Ridley, I. (2006). A simple model for predicting the effect of hygrothermal conditions on populations of house dust mite Dermatophagoides pteronyssinus. Experimental & Applied Acarology, 39(2), 127–148. DOI: 10.1007/s10493-006-9003-8. The building-physics model behind the “unmade bed” headline (S. Pretlove among the authors) — a model, not a clinical trial, and partly criticised by allergists. Accessed via PubMed.
• Physiological literature on “insensible water loss”: nightly moisture loss occurs via both breathing and skin, is variable, and partly leaves via the breath; the popular “a litre per night into the mattress” is disputed.