Are you making this common sheet mask mistake on flights?

There was a time when wearing a sheet mask on a plane caused curious stares and occasional pointing. After a trip to Korea some 10 years ago, I became an early adopter for sheet masks when travelling – and it certainly caused a stir back then. With so many on the market, it can feel a little overwhelming working out which mask is right Getty ImagesHow do sheet masks work? "Sheet masks work on the principle of occlusion," says Dr Brendan Khong, an aesthetic doctor who blends the best of eastern and western principles. This ensures your newly plumped skin isn’t exposed to drying cabin air with nothing on top to lock the moisture in.