Sleep monitoring with Samsung Health app

[liner33]

I've been monitoring my sleep over the last few months via my Samsung S8 and Gear S3 watch

A more typical nights sleep for me looks something like this ie bad



Had a great night sleep last night and it looked like this



But seen some online that look like this



So I'm basically collecting data that I have little understanding of , does anyone else use this method and can tell me what a healthy nights sleep looks like ?