Which side do you sleep on? Now look at that side of your face.

Everyone treats sleep lines like "ageing." They're not. They're a fold.

Press your face into a pillow for seven hours and the skin creases — same as sitting on a shirt. In your twenties it springs back by lunch. After ~25, collagen drops and the fold sets a little more each night, in the exact same spot, until it stops fading at all.

That's the Crush. And on top of it, every time you turn — about twenty times a night — you drag that same skin across the fabric. That's the Drag.

Botox, retinol, sleeping on your back — every "fix" you've tried aims at one force and misses the other.

Silk is genuinely good — for the Drag. Less friction, less pull, less tug on the skin as you move.

But silk is still a flat surface. Your face still presses into it under the full weight of your head, all night. The Crush doesn't care how smooth the fabric is. A softer surface to be crushed against is still being crushed against.

That's why people buy the £40 silk case, feel like they did the responsible thing, and still wake up with the same line. They solved half.

Two of the most expensive things in your routine can't touch a sleep fold — for different reasons.

Retinol / night creams: you apply it, then press half of it into the pillow and drag the rest across the cotton before it absorbs. Most of what you paid for ends up in the wash.

Botox & filler: brilliant on expression lines — the ones you make by frowning and smiling. A sleep fold is a compression line. Different cause. Botox relaxes a muscle that isn't the problem, so the crease keeps coming back on the side you sleep on — and you keep paying to top it up.

If you're already investing in your face, this is the one thing quietly undoing it every night.

The obvious advice is "just sleep on your back." You've tried. You wake up back on your side, because you move ~20 times a night and you can't consciously control eight hours of it. Wedges and pillow forts don't hold either.

Lunéa doesn't fight your body. The four-lobe shape has a recessed pocket in the middle. When you sleep on your side — exactly as you already do — your head rests on the raised edges while your cheek and eye area sink into the pocket, lifting them off the surface so they float free, touching nothing. You don't change the habit. The pillow changes what the habit does to your face.

Go to a mirror. Which side do you sleep on? Look at that side.

The deeper crow's foot, the more etched cheek line, the tireder under-eye — they're almost always on the side you fold into the pillow. Once you've seen it, you can't un-see it.

Here's the part that matters: because it's a fold, not decay, stopping the compression stops it getting worse — and softens the newest lines that haven't fully set. The line you're looking at is roughly as good as it's going to get only if you change nothing. Every night on a flat pillow deepens it. Tonight can be the first night it doesn't.