Waking up with creases on one cheek that fade by mid-morning is common enough that most people stop noticing it. The question is whether those temporary lines eventually stop fading. There is reasonable evidence that sustained pressure on the face during sleep contributes to certain lines over years, and that the pattern differs from the lines caused by facial expression.
Two different kinds of line
Understanding which type you are dealing with changes what is worth doing about it.
- Expression lines form from repeated muscle movement. Frown lines between the brows, crow’s feet at the outer eye, and forehead lines all follow the direction of the muscle underneath
- Compression lines form from the face being pressed and folded against a surface. They tend to run vertically on the cheeks and across the chest, and they do not correspond to any muscle
A useful clue is symmetry. Expression lines are usually roughly even on both sides because both sides of the face move together. Compression lines are often noticeably worse on whichever side you favour at night.
How compression lines develop
Skin folded under pressure for hours recovers less completely as we get older. Collagen and elastin give skin its ability to spring back into shape, and both decline with age.
Younger skin flattens out the creases within minutes of getting up. Over time that recovery slows, then becomes incomplete, and the crease gradually becomes a line that is visible regardless of how you slept.
Because most people keep a consistent sleeping habit for decades, the pressure is repetitive and always in the same place. That repetition is what makes it matter over a lifetime, rather than any single night.
Age plays a role here as well. Younger adults typically shift position roughly 27 times per night, while older adults average closer to 16 (Anson et al., Aesthetic Surgery Journal, 2016). Fewer shifts mean longer periods of sustained pressure on the same area, at the same time that the skin’s capacity to recover is declining.
Which positions make a difference
The three common sleeping positions differ in how much of the face is under pressure.
- Back sleeping puts no sustained pressure on the face at all and is the position least associated with compression lines
- Side sleeping concentrates pressure on one cheek, the nasolabial area and often the outer eye, which is why asymmetry is common in long-term side sleepers
- Front sleeping presses the largest area of face into the pillow and tends to affect the forehead and around the mouth as well as the cheeks
Side and front sleepers also compress the chest, which is why vertical lines between the breasts are frequently seen in people who have slept that way for years. The chest has thinner skin and less underlying fat than the face, so it tends to show the pattern earlier.
Position is rarely fixed through the night. Most people cycle through several, and what matters is where the majority of hours are spent rather than the position you fall asleep in. That is also why people are often poor judges of their own sleeping habit, and why the asymmetry on their face is sometimes the first reliable evidence of it.
| Expression lines | Compression lines | |
|---|---|---|
| Cause | Repeated muscle movement | Sustained pressure against a surface |
| Typical sites | Brows, forehead, outer eye | Cheeks, chest, nasolabial area |
| Symmetry | Usually even both sides | Often worse on the favoured side |
| Direction | Follows the muscle | Vertical, unrelated to muscle |
| Changed by sleep position | No | Yes |
What actually helps
Changing how you sleep is harder than it sounds, since people move throughout the night without any awareness of it. Realistic options are worth more than perfect ones.
- Try to start the night on your back. Even partial success reduces total hours of compression
- Consider a silk or satin pillowcase. Lower friction means the skin slides rather than bunching, though it does not remove the pressure itself
- Look at pillow height. A pillow that pushes the head too far forward increases folding at the neck and jaw
- Support your position. A pillow along your back makes rolling onto your side less likely
- Keep skin well hydrated. Skin with a compromised barrier creases more readily and recovers more slowly
None of this reverses lines that have already established themselves. It slows the contribution sleep makes from here on, which is a different and more modest claim.
How much of the problem is sleep
Sleep position is worth keeping in proportion. Cumulative UV exposure is the largest external contributor to skin ageing by a wide margin, and in South Australia that exposure is significant for much of the year. Smoking, sleep quality, and genetics all play a part as well.
Sleep position sits below all of those. If you are going to change one thing, daily sun protection will do more than a new pillowcase.
The two are not mutually exclusive, but the order of priority matters if effort is limited. Practical guidance on UV exposure is published by healthdirect’s sun safety information.
There is also a difference between what causes a line and what maintains it. Sun exposure degrades the collagen and elastin that would otherwise let skin recover from folding.
So the two interact: skin that has had decades of UV exposure creases more readily under pressure and recovers from it more slowly. Improving one improves the response to the other.
A few other habits contribute to the same pattern of pressure and folding.
- Resting your chin or cheek on a hand while working or reading
- Holding a phone between shoulder and ear
- Sleeping with the face pressed into a forearm rather than the pillow
- Tight sleep masks that sit hard against the skin all night
None of these matter much on their own. Repeated daily over years, they add to the same total.
What the evidence actually shows
The strength of the evidence deserves a frank assessment. The mechanism is well accepted: mechanical compression of skin over long periods produces folding, and skin with reduced elastic recoil holds that folding for longer. A 2016 review in the Aesthetic Surgery Journal documented how compression, tension and shear forces during sleep produce a distinct category of wrinkle, separate from expression lines (Anson, Kane and Lambros).
What is harder to quantify is how much difference changing position makes for an individual, because running a controlled trial on decades of sleeping habits is impractical. Most of what is written about pillowcases and sleep training is reasoning from the mechanism rather than from trial data. That does not make it wrong, but it does mean the honest answer on how much it will help is that nobody can give you a number.
Treat it as a low-cost adjustment with a plausible benefit rather than a proven intervention, and weight your effort accordingly.
Sun protection does more for skin ageing than any change to how you sleep. Treat sleep position as a small additional gain, not a substitute for daily SPF.
When lines are already established
Once a compression line no longer fades during the day, behaviour change will not remove it. At that point the question becomes whether treatment is worth pursuing, and that depends on the depth of the line and how much it bothers you.
Approaches that stimulate collagen, such as skin needling, LED light therapy or non-ablative laser, are sometimes discussed for textural lines. Deeper folds around the nose and mouth are a different question again. If this is something you want assessed, the clinic can talk through treatments for fine lines and wrinkles and what is realistic for the lines you actually have.
Any treatment carries risk, including bruising, swelling, pigment change and infection, and outcomes are not guaranteed. Assessment by a registered health practitioner is required before proceeding, and it is the only way to get advice specific to your skin. General information on skin ageing is published by the the Better Health Channel.
Common questions
Do sleep lines go away?
Early on, yes. Creases visible on waking typically settle within an hour or so. The concern is the point at which they stop settling completely, which happens gradually rather than suddenly.
Does a silk pillowcase prevent wrinkles?
It reduces friction and drag on the skin, which may help. It does not eliminate the pressure that causes compression lines, so it is a partial measure rather than a solution.
Is one side of my face more lined than the other?
Asymmetry is common in long-term side sleepers and often follows the favoured side. Sun exposure through a car window on the driver’s side can produce a similar pattern, so the cause is not always sleep.
Can I train myself to sleep on my back?
Some people manage it with pillow support and consistency over several weeks. Others find it does not stick. Partial change still reduces total compression time, so it is worth attempting even if imperfect.
What is the best way to sleep to avoid wrinkles?
Back sleeping keeps the face clear of the pillow and avoids the compression that contributes to sleep wrinkles. If back sleeping is not comfortable, a silk or satin pillowcase reduces friction, and a supportive pillow at the right height limits folding at the jaw and neck. Even a partial shift toward less time on one side reduces total compression over the years.
Can compression lines actually be treated?
Once a line no longer fades during the day, behaviour change will not shift it, but it may still respond to treatment. Collagen-stimulating approaches are the usual starting point for textural lines, and deeper folds are assessed differently again.
What suits you depends on the depth and location of the lines, which is what an assessment is for. If sleep comfort is a factor, keep in mind that a position which disrupts your sleep is not a good trade for your skin.
The short version
Sleep position makes a genuine but modest contribution to facial lines over decades, mostly through repeated compression on one side. Back sleeping avoids it, a smoother pillowcase reduces friction, and neither undoes lines that are already there.
Sun protection remains the higher priority. If existing lines are what concern you, an assessment at our Kent Town clinic in Adelaide is the practical next step.
If lines that no longer fade are what bother you, an assessment will tell you what is realistic. Book a consultation at our Kent Town clinic in Adelaide, or call the clinic on (08) 8239 0431 to talk it through first.
