I agree Patti hasn't had a hypo - I was going to say bearing in mind if you aren't diabetic you can drop pretty damn low during the night anyway, without coming to any harm because it's natural for a body to do that - I get to think, providing we don't have too much IOB in the first place, it doesn't actually hurt us whatever unless we get into 'clinically hypo' territory under approx. 3.4.
In other words, reading what you've said, the Libre is exactly as reliable during the night for you as it was all day and all night for me. Yet - you trust what it tells you about trends and other things. Does not compute, sorry. And clearly a waste of time for trying to correctly set basal rates - which is what I primarily wanted it for apart from being interested to see whether I actually had any trends, any time.