For different reasons, the person may feel very tired and sleepy all the time. If a good rest is not helping, it might be the symptom of dehydration. A person with this disorder is rather slack due to the lack of water in the organism. As far as the fluid balance is the key to proper body functioning, the tiniest fluctuations have a significant influence on daily activities.
Continuous, annoying headache is another symptom of dehydration. As the organism goes on losing amounts of water, different types of salts are gone. This process changes the structure of blood. That’s why the brain lacks water and tries to keep away from the skull motivating a response in the pain receptors. The level of suffering depends on how the meninges is damaged and how much water the patient lacks.
Those who experience dehydration are usually easily annoyed and confused/lost in their thoughts. No matter how severe the problem is, a person has regular changes in behavior. The main reason is the fluctuation in electrolyte balances necessary to keep our mood more or less stable. The levels of serotonin may also be transforming, and this element predetermines emotions as well.