A fantastic episode of Make Me Data Literate on the science and data of sleep with Professor Darren Mansfield.
"So there are situations where data might be that, you know, dichotomous. But probably most of the time it isn’t. Most of the time it's a guide of variable degrees of strength and reliability. Sometimes it's a very good guide. Sometimes it's a rough guide. And sometimes data is completely useless. "
https://adsei.org/podcast/dr-darren-mansfield-on-sleep-data/