Mental tiredness after rest often occurs when emotional stress or constant worrying remains unresolved. Sleep may restore the body, but the mind can stay active due to anxiety, overthinking, or emotional overload. This type of fatigue builds slowly and can affect concentration and motivation. Practicing mental relaxation techniques, such as deep breathing or mindfulness, helps calm the mind. Reducing mental stimulation and allowing emotional expression also supports recovery. If mental tiredness persists, professional support can help identify underlying stressors and restore mental clarity.