Cool article but I'd just like to know why stand-ups have to be in the morning when I'm still getting into the groove of things. Why not end of day, all day you

Cool article but I'd just like to know why stand-ups have to be in the morning when I'm still getting into the groove of things. Why not end of day, all day you're waking up and building to that brief stand-up and it's either hey I need help or hey look what I/we got done. For that matter what if people have a good medical reason for not standing, does that mean stand-ups are an implicit form of discrimination against older coders?