Sleepiness after thyroid nodule surgery may be caused by anesthesia drugs that have not been fully metabolized, or it may be caused by hypothyroidism and other diseases, which need to be treated with general measures, medication, and so on. 1. Anesthesia drugs have not been metabolized: If the body has not fully metabolized the anesthesia drugs within a short period of time after the surgery, drowsiness may occur. If there are no other uncomfortable symptoms, usually after a period of rest, the symptom of drowsiness can be relieved, so there is no need to worry. 2. Hypothyroidism: Sleepiness after thyroid nodule surgery may also be caused by hypothyroidism. Patients can take oral levothyroxine under the guidance of the doctor, which will help improve the symptoms of drowsiness. There are many reasons for sleepiness after thyroid nodule surgery, and patients are advised to go to regular hospitals to find out the causes.