Bordeaux mustard is a strong, dark brown condiment made with black and brown mustard seeds and unfermented claret. Mixed with sugar, tarragon, and white verjuice, Bordeaux mustard has a sweet taste with just a tang of sourness to it. Besides, mustard in general has been known to help an individual sleep with its high content of magnesium, which is a mineral that is directly linked to improving the quality, duration, and tranquility of sleep. Mustards also help regulate the metabolism, to help reduce sleep disorders and the occurrence of insomnia.