Winter time 2026: prepare your sleep before the night of October 25

In brief: during the night from Saturday, October 24 to Sunday, October 25, 2026, at 3 a.m. it will be 2 a.m. An extra hour of sleep on paper, and often a few days of feeling out of sorts. What resets the internal clock is not the watch: it is light - and, when evening comes, its absence. Here is how to prepare for this shift, what research says about darkness, and the real role of silk in this ritual (neither magical nor nonexistent).

What exactly happens during the night of October 24 to 25

The switch to winter time takes place on the last Sunday in October. In 2026, October has five Sundays, so the change falls on the 25th, the earliest possible date - a configuration that had not occurred for six years. At 3 a.m., clocks move back to 2 a.m.

On paper, this is the “good” time change: the one where we sleep an extra hour. In practice, what we feel has less to do with that hour than with what comes with it. Mornings become bright again for a few weeks - then grow darker. And evenings suddenly shift: night now falls in the late afternoon, often before we have even left the office. Our bodies, meanwhile, continue for a while on their old schedule.

Why one hour is enough to shift sleep

Our sleep-wake rhythm is not set by the time displayed on a clock, but by external signals - the first of which is light. Morning light advances the internal clock; evening light delays it. When the clock face shifts suddenly and the distribution of light changes at the same time, it takes a few days for the two to realign.

That is why a one-hour change can result in a week of shifted wake-ups, difficulty falling asleep and mid-afternoon fatigue. Nothing serious, and nothing inevitable either: the shift can be managed in advance, in small steps.

What research says about darkness

One point deserves a closer look, because it has become a commonplace without anyone ever citing what it is based on: darkness. A randomized controlled trial published in 2026 in BMC Nursing tested a darkness protocol involving the use of sleep masks among hospitalized patients, measuring both self-reported sleep quality and melatonin levels (doi:10.1186/s12912-026-04995-0). It joins a small series of trials conducted in intensive care settings - using a mask alone or a mask combined with earplugs - several of which report improved patient-reported sleep quality.

Two caveats matter. First, these studies take place in hospitals, an environment that is noisy and continuously lit: the difference is necessarily greater there than in a room that is already quiet. Second, what is being tested is darkness - not a particular material. None of these studies compares silk with another textile. What we can reasonably conclude is that making a room dark seems to be a modest but real lever for self-reported sleep, and one that costs almost nothing to try.

The ten days before: shifting gently

Rather than taking the change all at once, I prefer to smooth it out. Here is the plan I follow, in three stages.

Three complementary habits are just as useful: keep a consistent wake-up time, including over the weekend of the change; go for a 20-minute walk in the morning, even under a gray sky - outdoor light on an overcast day is still much more intense than light indoors; and put off afternoon coffee, which becomes deceptive when the body is still on its old schedule.

What the material changes, and what it does not

A clarification, because it helps avoid disappointment: no textile resets an internal clock. What a material can do is remove reasons to wake up. And in the weeks ahead, those reasons change in nature.

At the end of October, the heating comes back on, bedroom air becomes drier, and we often add another layer to the bed. A fabric that regulates moisture and heat poorly can then produce those micro-awakenings we cannot explain the next day. Mulberry silk has the advantage of being thin without feeling cold, and remaining comfortable against the skin when the room temperature fluctuates. It is comfort, not a remedy: the effect is seen in how often we turn over, not in the structure of sleep.

Weight, meanwhile, is a choice - and at this time of year, it is the question that comes up most often. Our momme guide explains what changes when moving from 19 to 22 momme, and our article on silk in winter explains how to layer it without overheating.

Three items, three roles

• The sleep mask. This is the item most directly affected by the change of season: dark evenings do not prevent bright wake-ups caused by streetlights or device lights. In 22-momme silk, it remains lightweight, does not press against the face and does not leave marks on the skin when you wake up - a detail that makes the difference between a mask you keep wearing and one you remove at 3 a.m. See the Sleep Masks collection, and our guide to choosing the right one.
• The pillowcase. It does nothing for the internal clock, but a lot for contact comfort when the air dries out: less friction on the hair and a surface that does not pull.
• Sleepwear. A silk pajama set or nightgown avoids the too-hot / too-cold alternation of transitional-season nights, when you uncover yourself at 2 a.m. and cover yourself again at 5.

Frequently asked questions

What is the exact date of the time change in 2026?

During the night from Saturday, October 24 to Sunday, October 25, 2026: at 3 a.m., it will be 2 a.m. This is the earliest possible date for the switch to winter time.

How long does it take to adjust?

It varies greatly from person to person. For the switch to winter time - the easier direction - most people regain their rhythm within a few days, especially if wake-up time remains consistent and mornings are well lit.

Is a sleep mask really useful if my room is already dark?

Less so, logically. It becomes useful when light sources remain: a lit street, imperfect shutters, a glowing alarm clock, a partner with a different schedule, or an early sunrise in spring. If your room is already completely dark, the main benefit is contact comfort.

Should you change your bedding when the clocks change?

Not for the internal clock. But the date coincides with the heating being turned back on, and that is when it makes sense to review your bedding: the air becomes dry, the room warms unevenly, and summer bedding is no longer quite suitable.

Silk or satin for a sleep mask?

“Satin” refers to a weave, not a fiber: satin can be made from polyester. Mulberry silk is a natural, more breathable fiber. In a mask worn all night against delicate skin, the difference is felt mainly in the heat that builds up.

Preparing for the shift

The time change is not an event; it is a boundary: the point at which autumn stops being a pre-season and becomes winter. There are few useful habits, and they can be put in place within a week. The rest - the warmth of a well-designed bed, the darkness we give ourselves when we close our eyes - is less about performance than about attentiveness.

To prepare for these longer nights, explore our Silk Sleep Masks collection and our mulberry silk bedding.

- Inès, for the StudioSoie Journal