What's the point in brushing your teeth in the morning when you're going to be eating the whole rest of the day, like lunch and
dinner? In my opinion, unless I'm going out somewhere and need to wear a mask, of course. But if I'm just chilling at home I don't really think it matters, as long as you go about your day and after dinner you brush your teeth.
While you sleep bacteria trend to multiply so any bacteria that may be lingering can cause problems then it helps protect your teeth throughout the day by strengthening the enamel before you eat