Guerlain midnight secret is one of guerlains most coveted skincare lines and has been christened in the press as sleep in a bottle guerlain midnight secret is a luxurious treatment that instantly brightens tired stressed skin guerlain 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