Moderate consumption of ripe pu-erh is usually not harmful to men, but if consumed excessively, it may cause insomnia. Ripe Pu-erh tea is generally referred to as Pu-erh tea produced through fermentation, which is a common tea drink in daily life. Pu-erh tea is brownish red in color, mellow in smell, and contains vitamin C, theophylline, gallic acid and other nutrients, which are generally not harmful after moderate consumption. However, ripe Pu-erh tea contains theophylline, caffeine and other substances, these substances are prone to stimulate the central nervous system, resulting in increased excitability, if excessive consumption may lead to insomnia; men with sleep disorders are advised to drink as little as possible, especially at night should be avoided, so as not to affect the quality of sleep.