Skin itches more at night for real physiological reasons: body temperature rises slightly in bed, blood flow to the skin increases, and there is nothing to distract you. But if the itch is concentrated where your nightwear sits, the cause may be simpler than you think.
Fabric
Synthetic fibres irritate sensitive skin in two ways. They hold moisture against the surface, which softens and weakens the skin barrier, and they generate more friction. For anyone with eczema, dermatitis or simply reactive skin, 100% cotton is the standard recommendation from dermatologists — not because cotton is magical, but because it breathes and does not hold sweat.
Woven cotton is better than knitted hosiery here, because knit clings and clinging means friction. The differences are set out in the fabric guide.
Detergent residue
This is the most under-diagnosed cause. Detergent left in the fibre sits against your skin for eight hours a night. If your itch is generalised across everywhere the nighty touches, try this for two weeks:
- Halve the detergent you use.
- Add an extra rinse cycle.
- Stop using fabric softener entirely — it works by leaving a coating behind, which is exactly the problem.
- Skip scented detergents and any “freshness” additives.
Seams, labels and elastic
Hard printed labels at the neck, thick seams under the arm and elastic at the waist are common irritation points. Loose nightwear without a waistband avoids most of it. If a label bothers you, cut it out carefully at the stitch line.
Dryness
Much night itching is simply dry skin, which worsens in winter and in air conditioning. Moisturise after a bath while skin is still slightly damp, and let it absorb fully before dressing — pulling a nighty over wet moisturiser traps it and can make things worse.
A two-week test
If you are not sure whether it is the cloth or the detergent, change one thing at a time.
- Week one: keep your usual nightwear, but halve the detergent, add an extra rinse and stop fabric softener entirely.
- Week two: if it has not improved, switch to a 100% cotton nighty, washed the same way.
Most people find the answer in week one, which surprises them. Detergent residue sits against the skin for eight hours a night, and it is the most common cause we hear about that has nothing to do with the garment itself.
On fabric softener: it is the single most common thing we suggest people drop. It works by leaving a coating behind — which is precisely the problem for reactive skin, and it also stops cotton absorbing moisture properly.
When to see a doctor
Get it checked if the itch is severe enough to break sleep regularly, if you see a spreading rash, or if it is accompanied by yellowing skin, weight loss or night sweats — persistent generalised itching occasionally signals something that needs treating.
Browse 100% cotton nighties, or read how to wash them so residue never builds up.
Questions we get asked
Is cotton genuinely better for eczema?
It is the standard recommendation, because it breathes and does not hold moisture against the skin. Woven cotton is better than knitted, since knit clings and clinging means friction.
Should I stop using fabric softener?
For reactive skin, yes. Softener works by leaving a coating on the fibre, and that coating sits against your skin for eight hours a night.
Why is it always worse at night?
Body temperature rises slightly in bed, blood flow to the skin increases, and there is nothing to distract you. Add detergent residue and a synthetic fabric and it compounds.
