SleepDoc_PDX said:

If two explanations both fit, the useful question is which one predicts something the other does not.

Same experience, arrived at from the opposite direction. Posting only so the count is not one.

DanielChem_CHI said:

Practical: whatever you change, write down the date and the reason.

This is where I part company with the consensus forming above. The objection nobody has made: this only works if the measurement is doing what we assume it is doing, and that assumption has not been tested here.

DanielChem_CHI said:

Practical: whatever you change, write down the date and the reason.

True, with the qualification that this is a self-selected group. The people for whom it did not work post less, and that shapes everything we think we know.

Ask again with the specifics and you will get a better answer than this one.

DanielChem_CHI said:

Practical: whatever you change, write down the date and the reason.

That reframing is the part I needed. Sending this to two other people who asked me the same thing last week.

Moderator note: good thread. Keeping it here rather than moving it, because the question is general enough to be useful. Thread quality here is what the rules are for. Keep it up.