The cult classic Laneige Lip Sleeping Mask has been designed to keep lips hydrated while you sleep and works overnight to reveal more soft and smooth lips.The famous/award-winning/cult favorite/holy grail of lip products - the Laneige Lip Sleeping Mask is designed to keep lips moisturised and hydrated while you sleep so that you awake with soft and supple lips. Famous the world over for its deeply rejuvenating formula, this lip sleeping mask can reduce flakiness and dryness overnight.