What time is best to wake up

It depends what do you want in your life. If you want material success. Many successful people wake up between 4am to 8am, while they go to there bed between 9pm to 2am. All they have sleep around 8 hours to 5 hours.

Every human being has there own. Sleep cycles. Some need full 8 hours of sleep. Some are fit with having 6 or 7 hours sleep, on contrary some consciously choose to sleep 6 hours.

It's totally up to you how many sleep hours you need. Based on that, choose your sleeping time and waking time. It's better to consciously choose our sleep than playing life on automode.

I wake up at 6:45am. It gives me time for exercise and meditation. Whatever you do in life. Make sure you are investing time in your health, relationships and personal interests.