Desiring privacy and resisting control are reasonable things people who enjoy their freedom and autonomy would want to do.
There are plenty of ways your data can be used against you and used to make incorrect assumptions about you.
Note, this isn't illegal or (in my opinion) even unethical, it just makes me and many others uncomfortable. If that's a tradeoff happy with, then more power to ya!
I guess that is mostly only applicable in the US with our for profit healthcare system though.
It isn't just health insurance you need to think about.
This is about autonomy and protecting civil liberties. Surveillance should be viewed through the lens of "would this be okay if a person was in place of the machine?"
I do not want someone watching my sleep so they can tell all their friends.