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Seven Diabetes Patients Die Due to Undisclosed Bug in Abbott's Continuous Glucose Monitors
(sfconservancy.org)
This is a most excellent place for technology news and articles.
I eventually figured out that the Freesytle Libre will significantly underread if you sleep on it. I would recommend doing a finger prick test before acting upon what a CGM tells you to do.
Found that on day one, pretty sure it's even in the instructions not to put the sensor somewhere you'll put pressure on.