Hormone analysis is one of the important analyses for further therapy and accurate diagnosis. However, not all hormones can be measured in blood. This includes, for example, the hormone melatonin, which is relevant for sleep. Those who produce too little melatonin may have trouble sleeping through the night and still feel unrested after 8-10 hours of sleep. In cases of overproduction of melatonin, fatigue is omnipresent, one feels constantly foggy, and falls asleep quickly.