A lack of sleep can severely impact athletic performance by impairing reaction time, reducing endurance, and diminishing overall physical output. Sleep is essential for muscle recovery, hormone regulation, and cognitive function, all of which are vital for optimal performance. Insufficient rest can lead to increased levels of cortisol, the stress hormone, which may hinder recovery and lead to burnout. Prioritizing quality sleep enhances focus, energy levels, and recovery rates, ensuring that athletes perform at their best during training and competition.