At-home high-impact steps: hydrate, ventilate the room, take a short walk or stretch, eat a small protein+fiber snack, and get daylight. If sleep debt is obvious, a brief nap (around 20 minutes) can help. Sugary foods and energy drinks often cause quick rises and crashes. If low energy lasts several days, consider infection, iron/B12 deficiency, or thyroid issues. Seek medical care if you develop red-flag symptoms like shortness of breath, palpitations, fainting, or chest pain.