Being very sleepy after taking birth control pills may be caused by side effects of the medication. Contraceptive pills are a class of drugs that have the effect of preventing pregnancy, and there are many types, such as compound short-acting oral contraceptives, emergency contraceptives and so on. Contraceptive pills contain both progestin and estrogen, with progestin playing a major role. Sleepiness after taking birth control pills may be caused by the side effects of the drug. Contraceptive pills contain a large number of hormone components, after taking the pill may lead to changes in the body’s hormone levels, which in turn triggers the patient to want to sleep and other conditions. For women with abnormal liver and kidney functions, breast cancer, liver cancer, abnormal blood clotting function, thrombotic diseases or those who need to stay in bed for a long period of time after a major surgery, contraceptive pills may produce adverse side effects for women with the above conditions, and oral contraceptive pills are generally not recommended for these women. If you feel unwell, you should go to the hospital in time to avoid delaying your condition or triggering adverse reactions.