Actually, it shouldnt say "something important", but is is a good tip. People often run on autopilot. If the routine changes (such as who leaves thier children at daycare or taking a different route due to constructuon) you can forget YOU were the one with the child, or think that you dropped them off when you didn't. Most women won't get five steps without thier purse without feeling like something is wrong (because they always have thier purse on thier arm, it feels like you're naked) while it might take longer for things to feel off without their , because they don't always have their baby.
For example, have you ever been going somewhere whose route starts the same as going to work, then you realize you took the turn you would take to go to work instead of the one for where you were going to right then?
Now multiply that by lack of sleep and not being able to take a break because life goes on.