Wether you have trouble sleeping or not, it allows you to measure what "good" and "bad" is for you.
If I have alcohol before I sleep and don't use a sleep tracker, I generally assume I have a bad nights sleep. But my interpretation is all anecdotal. A sleep tracker can tell me though that I get up X more times when I have alcohol, I sleep Y less hours in each stage, I have a higher heart rate by Z much, have a lower heart rate variability, etc.
And you may think "so what?" We'll, that's the whole point. Now you know...not just "kind of know" that alcohol is bad for you.
It allows you to confirm what you think may be true, but can't prove.
It also shows when I woke up in the middle of the night, which isn't always obvious to me when I fall back asleep soon after, but definitely impacts my sleep quality.
Without proper sleep, life loses a lot of its value.
For myself the sleep duration tracking is the most useful data generated from sleep tracking.
What's weird about the fructose is I don't have the symptoms associated with such an intolerance; namely gas. Good news is that there is an enzyme (Fructaid) that helps mitigate it for me, so I don't have to completely cut it from my diet.
In the US, sulfites can be sneaky. Labels are required to list them if directly added to a product, but not for sulfite-containing ingredients sourced from a third-party. So the raisins in that trail mix very likely contain sulfites.
Oh man, I remember those days. Enjoy them while you have them.