I was prescribed Yaz to treat a hormonal imbalance.testosterone too high. the first day i expected the nausea and dizziness, so i took it at night. the next day i took it earlier 8pm and went to bed. i woke up at 930 am the next day because my daughter literally rolled me over to wake up and poked at me for a while she said i looked if i was dead. i went to work and was groggy the whole day, felt my tongue heavy and had several dizzy spells. It was scary.... i read in the booklets and did not find drowsiness as a common side effect but when I googled it I was surprised i was not the only one to experience drowsiness...