I remember a booklet my mother gave me when I was 12 or 13, I would guess. It gave a lot of very useful information, such as "after meals, rise and stand by your chair ready to follow your mother's instructions"...

And I also remember it telling me that "when you go to bed, lie down decently and straight, keeping your hands out from under the covers." (I've always loved the phrase since: decently and straight LOL.)