What causes body aches and weakness upon waking up?

Waking up with body aches and weakness may be due to going to bed relatively late, waking up too early, or having insufficient sleep, resulting in inadequate rest. It could also result from prolonged heavy physical labor or intense exercise, causing excessive fatigue and buildup of lactic acid in the body. Additionally, persistent anxiety and stress leading to nervous system dysfunction, or inadequate food intake causing hypoglycemia, may also produce such symptoms. It is recommended to seek timely evaluation and diagnosis.