- Newborns: Have irregular sleep patterns with frequent awakenings. - Infants: Begin to develop a more regular sleep-wake cycle. - Toddlers: Usually have one nap per day and sleep more through the night. - Preschoolers: Often transition out of naps and require a consistent bedtime routine. - School-age children: Need a stable sleep schedule to support academic and social activities. - Teenagers: Experience changes in their circadian rhythm, often leading to later bedtimes and difficulty waking up early.