Sleep is closely related to sex. Recently, research published in the American "Health" journal shows that poor sleep quality in men will affect erection, sleeping 6~8 hours a night can reduce the probability of erectile dysfunction in middle-aged and elderly men. Sleep specialists at the Einstein College of Medicine in the United States monitor the volunteers' sleep status and nocturnal erections. It was found that the nighttime sleep mode was divided into two types, one was deep sleep, which lasted about 1.5 hours, and the other was light sleep, about 30 minutes, and the two modes were combined into a sleep cycle that lasted about 2 hours. During light sleep, men experience an erection. In general, it is necessary to repeat 4 cycles of sleep throughout the night, and men will also have 4 unconscious erections. This allows the penis to get enough rest, and the hormones in the body will be regularly regulated. Staying up late at night and sleeping irregularly can affect th...