Suddenly sleeping too much can have a number of causes, particularly for women. Hormonal fluctuations (pregnancy, perimenopause, menstrual cycle variations), thyroid imbalance, iron or B12 insufficiency, depression, long-term stress, or poor sleep quality are common causes. Fatigue can also be exacerbated by illnesses or sleep apnea. Other drugs could also play a role. See a doctor if excessive sleep persists for more than two weeks, gets worse, or is accompanied by weakness, mood swings, or changes in weight. Modvigil 200 and other stimulants encourage alertness but don't address the root reasons. Blood testing and a comprehensive assessment can help determine the cause.