It’s a habit most of us rarely question. After a long day, we slip into our favorite cotton panties or comfy shorts and head straight to bed.

But recent findings are casting doubt on this well-worn routine. According to some lingerie experts, sleeping in underwear might actually harm both our comfort and our intimate health. Curious? Here’s what they’ve uncovered—you may never look at your lingerie drawer the same way again.

A breeding ground for intimate discomfort

We don’t always realize it, but underwear—even cotton—can trap heat and moisture throughout the night. This creates the perfect environment for bacteria and yeast to multiply. The result? A higher risk of discomforts like itching, irritation, or even unpleasant infections.

Experts at the French brand Belle Lingerie recommend going lighter at night—or skipping underwear altogether—to let this sensitive area breathe freely. A small change that could save you a lot of trouble.

Irritation, friction… and unhappy skin

At night, our skin is supposed to regenerate. But prolonged contact with lace, elastic, or synthetic fabrics tells a different story—especially if you toss and turn in your sleep. Rubbing, redness, or rashes can appear quickly. For those prone to eczema, the irritation can become particularly disruptive.

The importance of airflow and comfort

We don’t often think about it, but proper airflow is key to intimate health. Underwear can block the skin from breathing properly, encouraging sweat and bacteria to build up. The consequences? Clogged pores, unpleasant odors, and even small breakouts in areas like the groin or inner thighs.

A loose cotton pajama set can make all the difference: it covers without smothering and allows air to do its job.

Unexpected effects on sleep quality

Tight panties, a bra strap that slips, or a scratchy tag—these little annoyances can interrupt restful sleep. And as we know, poor sleep quality affects everything from mood to focus. Sleeping without restrictions could mean better nights—and better days.

Men, take note: temperature matters!

This isn’t just about women. For men, the temperature around the testicles plays an important role in sperm quality. If the area overheats at night, fertility could be affected in the long run. Proper ventilation during sleep helps keep things cool and stable, which is vital for the body’s function.

Synthetic fabrics: a hidden risk?

Some underwear is made with chemically treated fibers, dyes, or special finishes. When in constant contact with skin, these can disturb the body’s natural balance—and potentially even affect hormone health over time. Sleeping without underwear (or choosing organic cotton sleepwear) can help reduce exposure and create a gentler routine.