I have had 3 days this week where I slept 9 or more hours!
The image above is my fitbit's capture and analysis of one of them.
Check out the Deep, REM, and Light sleep in the graph and the stats below it.
Notice the red line at around 2:15 AM... Red is used to identify when I am am awake. That is when I got up to pee...
You can find this and other sleep tips in the "#6 Fix your sleep." section of: "Things you can do to improve your Parkinson's experience.".