Just last week you were bragging to your friends and family about what a good sleeper your baby is. All those horror stories about waking up 10 times a night to a cranky, fussy baby don't apply to you anymore. A baby sleep regression is a period of time when a baby who was previously sleeping well experiences a temporary setback in sleep patterns. During a regression, your baby will go from sleeping soundly to waking up frequently during the night, is harder to calm or settle before sleep, wakes up early from naps, or fights nap times altogether. In many cases, it’s a combination of all three – which can be extremely exhausting, not to mention frustrating, on the parents!