Satin sleepwear clings because rubbing builds an electric charge, and dry heated air lets that charge stay put. Raise the humidity in the bedroom, moisturise your skin before dressing, and hang satin to dry instead of using a dryer. Switching to silk helps less than people expect, because silk builds static too.
This is a different problem from a dress clinging on a night out. A slip can rub against its robe, a fleece blanket or synthetic sheets for hours in bed. The usual hairspray and metal hanger tricks are not useful for something you sleep in, and we would not put hairspray on a slip you wear to bed.
Does satin cause static?
Yes, satin can build static, and dry air is what lets it build. Wikipedia's entry on static electricity explains that charge moves between two materials when they touch or slide against each other, and that this same effect is the cause of static cling in clothes. Humidity decides how much of that charge stays. The entry gives an example: walking 20 feet on a vinyl floor at 15% relative humidity can build up to 12 kV, while at 80% humidity the figure is only 1.5 kV. A bedroom with the heating on in winter sits at the dry end of that range. Most of our satin is polyester, which takes up little water, so a satin slip under a satin robe is two dry, smooth layers rubbing all night. The First Light Set is exactly that pairing: a light satin kimono robe over a long slip, with a main fabric of 95% polyester satin, not silk.
What stops static in the bedroom?
More moisture in the air is the fix that works on every fabric. The Sleep Foundation's guide to humidity and sleep puts the best humidity for sleeping generally between 30% and 50%, and says it should never go above 60%. If your room reads well below 30% in winter, a humidifier is the first thing to try.
- Run a humidifier, or dry a load of laundry in the bedroom, until the room sits in that range.
- Moisturise your skin before you dress, so the slip slides over damp skin instead of dry skin.
- Hang the satin to dry after washing. A tumble dryer is where much static is made.
- Swap fleece blankets and synthetic sheets for cotton, so the slip has a calmer surface to rub against.
Is silk less static than satin?
Silk is not the cure it is often said to be. Wikipedia's entry on silk gives it a good moisture regain of 11%, which is why it feels comfortable in warm weather, but it also says silk is a poor conductor of electricity and so susceptible to static cling. Silk pyjamas in a dry, heated bedroom can cling as well. Room humidity matters more than the fibre. If you prefer silk for other reasons, The Long Weekend Silk Set is 100% mulberry silk at 19 momme, cut relaxed through the shoulder and body, with straight full-length trousers. A looser cut touches less of you, which is the part of cling you can control through the garment.
| What you change | Effect on static | Why |
|---|---|---|
| Room humidity to 30–50% | Largest | Moist air lets charge leak away from any fabric |
| Line drying instead of tumble drying | Large | The dryer rubs and heats the fabric at once |
| Cotton sheets instead of fleece | Moderate | Changes what the slip rubs against all night |
| A looser cut | Moderate | Less of the fabric touches skin |
| Silk instead of polyester satin | Small | Silk also builds static in dry air |
What our satin care notes tell you
Every satin piece we sell says it is not silk, and every care note ends with hang to dry. That is the first defence against static. The Champagne Problems Satin Slip is 95.9% polyester and 4.1% spandex, and its slight A-line skims the waist and hip rather than shaping them. It touches less of you, so it can feel less clingy even though the fabric is polyester. The Nightcap Set is a cool-touch satin-finish knit, also not silk, and its care note asks for a cool hand wash and hanging to dry. It dries fast, which helps it skip the dryer altogether. Neither piece is static-proof in a dry room. The care note is there to keep the dryer from adding to the problem.
For the material terms, read the difference between silk and satin. Our robe and slip styles are together in the sleep robes collection.
What should you skip?
Skip hairspray on sleepwear. It leaves a residue on something you wear in bed. Do not tumble dry satin in the hope that warmth will settle it, because it usually adds charge. A little fabric conditioner in the rinse is the one product worth trying: Wikipedia's static electricity entry lists fabric softeners and dryer sheets among the antistatic agents used to prevent static cling. Rinse it well afterwards. For fabrics that sleep cooler, see our guide for hot sleepers.
FAQ
Why does my satin slip only cling in winter?
Winter heating dries indoor air, and dry air lets charge build on the fabric instead of leaking away. In summer the room holds more moisture, so the same slip rubs against the same robe without much cling. A hygrometer by the bed will show you how dry the room gets.
Can you use a dryer sheet on satin pyjamas?
You can wipe a dry satin piece lightly with an unused dryer sheet to calm cling before bed, but do not put satin in the dryer to use one. Our satin care notes all say hang to dry. Test the sheet on an inside seam first.
Does static damage satin?
No. Static is uncomfortable, and it can make a slip ride up or stick to a robe, but it does not harm the fibre. What does wear satin down is heat and rough handling, which is why the care notes ask for cool water and hanging to dry.
Is a humidifier safe to run next to satin sleepwear?
Yes, at normal settings. Keep the room below 60% humidity, which the Sleep Foundation treats as the upper limit, and do not point the mist at clothes hanging nearby. Damp fabric left in a closed cupboard is the thing to avoid.
