Energy Notes give you the option to keep a diary. This helps you with helps tracking the reasons on the fluctuations in your energy levels more accurately. 

For instance: In your Energy overview you see a dip in your Energy level on Monday. You think that was due to a hard day at work. Just press the day and then "Add Note". This will also help us understand and formulate clear analysis on your energy levels. 

Note: due to privacy reasons we can't see your actual notes. We can only see the attached emotional state, depicted in an Emoji.