67 contributions on day 10, as of 3:42pm EST. I wear my watch from about 6:00am until about 1:00-2:00am, and sometimes even later. 4-5 hours is enough sleep for me. I do occasionally wake up a little later somedays and go to bed around 11:00pm or midnight.
Edit: 68 contributions now as of 4:12pm EST.

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That is the thing I do not understand and mentioned this in a prior post in this thread. Why would you want to get feedback? Per what the study says is only people who have a heart arrhythmia detected from the Apple Watch will get feedback and a free FaceTime conference with one of the doctors that are part of the study.
So, it makes no sense that people want feedback unless they are hoping to have heart disease.
I did say that I think it would be cool to get some feedback on how your participation in the study went and maybe get some sort of summary of how your contributions contributed etc...