Sleep plays a central role in regulating energy, cognitive performance, and overall metabolic balance. Insufficient or poor-quality sleep disrupts circadian rhythms and impairs neurotransmitter activity, leading to increased daytime lethargy. During deep sleep stages, the body repairs tissues, consolidates memory, and restores hormonal equilibrium. When sleep is shortened or fragmented, cortisol levels may rise while growth hormone secretion declines, contributing to fatigue and reduced alertness. Chronic sleep deprivation can also weaken immune response and slow recovery from illness. Maintaining consistent sleep schedules, limiting stimulants, and optimizing sleep hygiene are essential strategies for reducing lethargy. Reliable healthcare sourcing, such as a cephalexin capsules supplier, supports effective treatment compliance.
