👉 The evening fluid refers to the natural increase in bodily fluids, particularly blood volume and plasma, that occurs as daylight fades and the body prepares for sleep. This physiological response is part of the circadian rhythm, a 24-hour internal clock that regulates various bodily functions. During the evening, hormonal changes, such as increased levels of melatonin and decreased cortisol, contribute to this fluid shift. The elevated blood volume helps maintain blood pressure and ensures adequate circulation to vital organs, while the increased plasma supports the body's metabolic processes during rest. This fluid adjustment is crucial for preparing the body to conserve energy and facilitate restorative processes during sleep.
