Guerlain Issima Midnight Secret is one of Guerlains most coveted skincare lines and has been christened in the press as 'Sleep in a bottle'. Guerlain Issima Midnight Secret is a luxurious treatment that instantly brightens tired, stressed skin. Guerlain Issima Midnight Secret is a soothing night treatment designed especially for "the morning after." Simply smooth three drops of this oxygenating and invigorating lotion before you go to bed and wake up with refreshed, hydrated, clearer, and invigorated skin.