Swiss brand Dagsmejan has introduced a range of peptide-infused nightwear designed to improve skin hydration while promoting better sleep. The garments, priced from £120 for a T-shirt and £130 for trousers, feature a proprietary fabric called NATTCOLLAGEN™, which incorporates marine collagen peptides into the fibers themselves rather than applying a temporary surface coating.

Dagsmejan co-founder Catarina Dahlin explained that the initial goal was to develop sleepwear that helps regulate temperature, a key factor in achieving restorative sleep. The embedded peptides are intended to capture moisture from the air, creating a more hydrating microclimate next to the skin. This environment aims to reduce water loss through the skin’s barrier without leaving a damp feeling, supporting skin hydration and potentially reducing signs of aging.

An independent pilot study involving 20 participants over the age of 35 employed corneometry—an established method for assessing skin hydration. Results indicated a 40% increase in skin moisture and a 12% improvement in skin smoothness after four weeks of wearing the pyjamas, along with the appearance of smaller pores. However, the limited sample size calls for cautious interpretation of these findings.

In an individual trial, measurements using both a home skin analysis device and a professional clinic scanner confirmed low baseline skin hydration levels typical of aging and environmental exposure. Following several weeks of wearing the peptide-infused nightwear nightly and maintaining a consistent moisturizing routine, the wearer observed moderate improvements in hydration and skin texture. Measurements shifted from a “dry” to a more normalized hydration range, suggesting a positive but gradual effect.

Dermatologist Dr David Jack expressed skepticism about the efficacy of skincare delivered via fabric. He noted that creating a moist environment by occlusion might be uncomfortable and recommended established topical treatments such as exfoliation with salicylic or azelaic acid, the use of retinoid creams, moisturizers containing ceramides, and regular application of sunscreen as more reliable strategies for managing dry, aging skin.

While the nightwear was praised for its softness, flattering fit, and temperature regulation, the high price point may limit accessibility. The company advises washing the pyjamas every few days, avoiding tumble drying to preserve their properties.

Overall, the peptide-infused nightwear offers a novel approach to addressing skin dehydration during sleep, particularly for individuals in middle age facing year-round dryness. Although results are not dramatic and currently supported primarily by preliminary data and anecdotal evidence, the product may provide benefits as part of a broader skincare regimen for those willing to invest in the premium-priced garments.