Caffeine is probably one of the most widely used drugs on the planet due to effects. Caffeine is associated with increased alertness, energy, concentration. Caffeine helps to bring about the processes to activate choline, which is the building block for the neurotransmitter acetylcholine. One of caffeine’s products after synthesis is choline thus the increase is understandable. In numerous studies, including one in 1994 at California's West Valley College, choline-injesting subjects performed better on memory tests within 90 minutes which supports thoughts on caffeine. In the study The effects of coffee consumption on sleep and melatonin secretion researchers looked at how caffeine interfered with melatonin. Melatonin is a hormone in humans that increases sleepiness, decreases core temperature, and increases peripheral temperature in humans. It is essentially is one of he factors responsible for us as humans feeling tired and actually falling asleep as well as staying asleep. The researchers found that coffee consumption interferes with sleep quantity and quality due to it messing with the amount of melatonin the body utilizes or feels the effects of, thus making us feel less sleepy.