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Les Carnets de Tinùviel: Lessive maison, qui lave bien et qui sent bon !

Website for calculating what time you should go to bed depending on what time you have to get up. It's not based on how many hours of sleep you need but rather where in the cycle you would wake up. Waking up in the middle of a sleep cycle leaves you feeling tired and groggy, but waking up in between cycles lets you wake up feeling refreshed and alert.