Sleep is often underestimated, yet it fuels every part of human life — from memory to mood to metabolism. Poor sleep disrupts hormones, weakens the immune system, and reduces focus and creativity. Good sleep hygiene involves consistent bedtime routines and a calming sleep environment. Keep your room cool, dark, and quiet. Avoid screens 30 minutes before sleeping; blue light suppresses melatonin. Eat light at night, and try to maintain a regular schedule, even on weekends. Quality sleep is not a reward — it’s a requirement for a sharp mind and a strong body.