My kids know that when I'm on my computer, they need to get their own snacks and entertain themselves . . . said no work-from-home parent ever. Your kids don't care about deadlines or work pressure. When they see Mom, they automatically see an "on duty" sign lit up across your chest, which means you'll have to tell them to leave you alone way more than your guilt tolerance will probably allow. You'll make it up to them later, you tell yourself.