Feeling tired can stem from various sources, categorized into physiological, psychological, and spiritual components. Physiologically, it's divided further into circadian and metabolic factors, with the latter involving considerations like blood sugar, nutrition, and inflammation. Tiredness might not always indicate a sleep issue; it could reflect a lack of motivation or meaning in life, suggesting that psychological or spiritual aspects are at play. Effective diagnosis requires understanding these multifaceted layers to address the true root of fatigue rather than merely treating symptoms with sleep adjustments or supplements.