Today is Tuesday 17th November. I look at "last night" sleep data. Last night was Monday night of course, because tonight will be Tuesday night. Do you agree? Okay, so, looking further back, the night before last night (which was Sunday night)... is... called "Monday night".. which is wrong. There's a problem with checking , say last Wednesday nights sleep, because I actually have to remember to check Thursdays sleep. This needs correcting!