Best time to wake up?

You need to have had enough sleep to start the day, so it's best to sleep at least 7 hours.

whenever you feel fresher and your body gives signal

This is totally up to you! I like to get started around 8-9am. But I do know some highly successful owners who don't start working until 1pm and later!

5 am - my favorite time. But unrealistic with how late I stay up most nights :(

A time when you can wake up consistently and after adequate rest