How do I remove Bedtime in IOS 13
Unfortunately it seems as thought for now IOS 13.1.3 does not have an option to remove once setup. There seems to be a lot of push back so this may change. 

However, in the meantime you can under the bedtime tab in the clock app select the "Bedtime option and disable it, and then go back and ensure that alarms are set and reconfigure if needed. 

Ultimately at this time if you have automatic backups turned on and you know when you enabled it you can erase all content and settings which will factory reset your phone and then  restore from that specific backup.