I have found that though you may feel better than you did yesterday, you probably shouldn't spend the day cleaning the house. You will end up feeling worse again.
I have found that though you can set my computer to defragment on a schedule, it won't. But it will make rude noises at you when it feels like being a diva.
I have found that though you cough and cough for three weeks straight, you will get your voice back. And be able to sing a lulluby to your baby for the first time in almost a week.