Some babies do well cat-napping for 20 minutes at a stretch, they aren’t irritable when they awake and sleep well during the night. But if your child remains cranky after waking, looks tired all day and sleeps poorly at nighttime, you may want to help improve her sleep patterns during the day. Babies who get efficient naps during the day tend to sleep better at night and allow both you and your baby time to recharge in order to enjoy the rest of the day.