Do I need to press a button or take action to start tracking my sleep? No, your CZ Smart Gen 2 Hybrid smartwatch will automatically track your sleep so you don't need to take action to enter or exit sleep mode. Related articles What type of sleep activity is being tracked? Does my CZ Smart Gen 2 Hybrid smartwatch monitor my heart rate? The iiideas feature is not available on my hybrid Gen2 smartwatch? How do I customise my complication on my Gen2 Hybrid Smartwatch?