Autumn hair loss: reduce breakage at night

In short: seasonal autumn shedding is a physiological phenomenon, and it passes. What doesn’t go away on its own is breakage—those short, brittle hairs that add to the morning count and make it seem as though everything is falling out. Breakage largely happens at night, on the pillow. That’s where silk makes a measurable difference.

Every year, the same scene: at the beginning of autumn, I run my hand through my hair and come away with a handful. Then in the shower. Then on my coat collar. We all have that little moment of panic. So before we talk about silk, let’s put things in perspective—because the truly useful step isn’t the one you might think.

Autumn shedding: what’s really happening

Hair follows a three-stage cycle: a long growth phase (anagen, lasting several years), a short transition phase (catagen), and then a resting phase (telogen), at the end of which the hair falls out to make room for its successor. At any given time, some of your hair is in the resting phase—and those hairs will fall out anyway.

What makes autumn different is that this shedding becomes synchronized. Summer light exposure prolongs the growth phase; when the days grow shorter, more hairs enter the resting phase at the same time and fall out two to three months later. Hence the peak in September, October, and November, often more pronounced in women. It’s seasonal, cyclical, and generally subsides within a few weeks.

In other words, you won’t stop this kind of shedding with an accessory. No one can, so beware of anyone who promises otherwise.

Breakage, on the other hand, is not seasonal—and it can be prevented.

Here’s my point. When we count the hairs we’ve lost, we’re adding together two very different things:

• Shedding: the hair falls out whole, with its small, translucent white bulb at the base. A natural cycle—nothing to do.
• Breakage: the hair has broken along its length. No bulb, often shorter than the rest, sometimes split at the end. This isn’t root loss; it’s mechanical damage.

The test is simple, and I really encourage you to try it: place a few of the hairs you shed in the morning on a light-colored surface and look at the base. Lots of short fragments without a bulb? It’s not your scalp giving way. It’s your night.

And that is excellent news, because unlike seasonal shedding, breakage is something we can reduce.

Why nighttime damages autumn hair

A night means six to nine hours of friction. We change position between twenty and forty times, and with each movement the hair is caught between the head and the pillow. On standard cotton, whose short fibers create a microscopically rough, absorbent surface, three things happen:

1. Friction lifts the cuticle scales, the protective layer that covers the hair like roof tiles. Lifted scales mean hair that snags, tangles, and then breaks.
2. Cotton absorbs moisture—from the hair itself as well as from your evening treatments. Dehydrated hair is stiff hair, and therefore prone to breakage.
3. Morning tangles require more aggressive detangling, which finishes the job.

Add the autumn context: hair still weakened by summer salt, chlorine, and sun; heating switching back on and drying out the air; and hair already in the midst of seasonal shedding. The fiber is at its most vulnerable point of the year—and that is precisely when it is subjected to eight hours of friction.

What mulberry silk changes

Silk is a continuous filament, smooth and produced as a single thread over hundreds of meters. There are no short fiber ends sticking up from the surface: hair glides instead of snagging. It is also significantly less absorbent than cotton, which means your evening treatments stay on your hair instead of being absorbed into the fabric.

In practical terms, when you wake up: fewer tangles, so gentler detangling and therefore less breakage. Less frizz. And ends that stay in good shape longer between trims.

A note, and I prefer to say it clearly: silk does not make hair grow back and does not affect the follicular cycle. It does not treat hair loss. It protects what is already there—which, during peak shedding season, means avoiding adding preventable loss to inevitable loss.

Bonnet or pillowcase: which should you choose?

The question comes up all the time. Here’s how I decide:

My advice during a shedding season: the bonnet, because it neutralizes friction along the entire length, including the ends that extend beyond the pillow. If you have textured, curly, or coily hair, it is not even optional — see our complete nighttime guide for curly and coily hair. And if you also care about skin benefits, the combination of a bonnet + a silk pillowcase is the complete version of the ritual.

The nighttime routine I follow in autumn

• Never sleep with wet hair. Wet hair is swollen, its cuticles are open, and its tensile strength drops. This is when it breaks most easily. Dry it at least 80%.
• Detangle in the evening, not in the morning. Use a wide-tooth comb, working from the ends toward the roots. This removes knots before a night's sleep tightens them.
• Tie your hair without pulling. A loose braid or a very loose high bun, secured with a silk scrunchie — never a thin elastic, which creates a sharp stress point.
• Put the bonnet on last, after applying your hair care products. It keeps everything in place and retains your oils on the fiber.
• Wash silk regularly, in cold water, with a gentle soap — see our care guide. Clean silk glides more smoothly and is gentler on your scalp.

What momme weight should you choose for a night bonnet?

Momme measures the density of the weave. Below 16, silk is too fine: it snags, loses its shape, and does not hold up well in the wash. Between 19 and 22 momme, you get the right balance of softness, structure, and durability — this is what I recommend for a piece worn every night. Above that, the material becomes stiffer, pleasant for bedding but less flexible for a bonnet. To understand the unit in detail, see our reference article: momme, the unit that changes everything.

When to consult a doctor

Seasonal shedding is diffuse and even, and subsides within six to eight weeks. However, if the shedding continues for more than three months, if you notice localized thinning, a widening part, or persistent itching, it is no longer seasonal: speak to a dermatologist. Iron deficiency, thyroid issues, the postpartum period, and prolonged stress are real, identifiable, and treatable causes. No textile can replace a diagnosis.

Frequently asked questions

How much hair do we lose per day in autumn?
People usually lose between 50 and 100 hairs a day. During the autumn seasonal shedding peak, this number may temporarily double for a few weeks without being abnormal.

Can a silk cap make hair grow back?
No. It does not affect the follicle or the growth cycle. It reduces mechanical breakage caused by nighttime friction, which helps preserve length and apparent density—but it is not a treatment for hair loss.

Can satin replace silk?
Satin is a type of weave, not a material: polyester satin is smooth but has neither the breathability nor the moisture regulation of natural silk, and it retains heat. To tell the difference, see silk or satin: what’s the difference.

Should I wear the cap every night?
Ideally, yes, especially during periods of shedding. The benefit is cumulative: repetition prevents wear, not a single night.

Is the cap suitable for fine hair?
Yes. Choose a style with a soft, non-compressive edge, and tie your hair without tension to avoid pulling on the roots.

Get through the season without sacrificing length

You have to endure autumn shedding. Breakage, however, is avoidable. If you change only one thing this season, change what happens between your hair and your pillow during those eight hours—it’s the simplest and most consistent lever in your entire routine.

Discover StudioSoie silk night caps →

— Mei, for the StudioSoie Journal