5 year old excessively sleepy after finishing antibiotics

Patient: My 5 year old just got finished with a course of antibiotics after being diagnosed with a mild bronchial infection. Today she is excessively sleepy, sleeping for more than 3 hours this morning, after an 11 hour sleep last night. Should I be worried? When she is awake she is alert and aware and not coughing much. What should I do?

Symptoms: Excessive sleepiness