Which of the following is NOT a sign of dehydration?

Excessive sweating is actually a physiological response that can be associated with dehydration rather than a sign of it. When the body becomes dehydrated, it tends to conserve water and may reduce sweat production over time, especially in more severe cases. The body may initiate sweating in the earlier stages as part of thermoregulation, but as dehydration worsens, the amount of sweat typically decreases because there's less fluid available to be secreted.

In contrast, thirst is a common early indicator of dehydration, signaling the body's need for additional fluids. Nausea can occur due to dehydration as well, as the body struggles to function properly without sufficient hydration, leading to gastrointestinal disturbances. Sleepiness may also present because dehydration can impair cognitive and physical functions, making an individual feel fatigued or lethargic. Therefore, excessive sweating is not a sign of dehydration but rather an initial mechanism the body employs to maintain temperature regulation.