Dosage and Thyming Make the Poison

Cafine is a stimulant, and it's in a class of drugs that we call the psychoactive stimulants. It can harm your sleep in at least three ways. Even just one to two cups of coffee in the early or late evening can decrease the amount of your deep sleep anywhere between 20 to forty %. Once you get past about three or four cups of coffee a day, then the health benefits start to go in the opposite direction - not only in terms of health but also in terms of sleep too.