Ask any pregnant woman and she'll tell you the same thing: Growing a baby is tiring. Therefore, sleep is essential for a woman's general outlook on life, health and hormonal balance [source: National Sleep Foundation]. Even if you weren't a napper before getting pregnant, chances are you'll become one during that first trimester. There's nothing wrong with listening to your body and laying down for a 20-minute power nap when you need one. You don't even have to fall asleep. Resting can have similar benefits to sleep. This way, you'll have plenty of energy when it comes to spending time with your partner, decorating the nursery, getting exercise and going to work [source: Haiken].