Understanding Baby Sleep

Noisy Baby Sleep: Grunting, Moving and Crying

Noisy Baby Sleep: Grunting, Moving and Crying

Why babies make noise during sleep Infant sleep is not a quiet, motionless state. Newborns spend a substantial proportion of sleep in active sleep, a state comparable in some ways to rapid eye movement sleep. During active sleep, breathing may be irregular, facial expressions may change, and the infant may make brief vocalizations. Small movements […]

Active Sleep vs Awake Behavior in Babies

Active Sleep vs Awake Behavior in Babies

What active sleep means in infancy Active sleep is the infant state broadly analogous to rapid eye movement sleep, although the terminology and physiologic boundaries in newborns are not identical to those in adults. It occupies a large proportion of sleep in early life. During active sleep, the brain remains relatively activated, while the body […]

Overtired vs Undertired Baby Sleep Signs

Overtired vs Undertired Baby Sleep Signs

Why Sleep Signs Can Be Difficult to Interpret Infant sleep is regulated by interacting biological processes rather than by a single timetable. Sleep pressure builds during wakefulness, while the circadian system gradually develops and helps organize day and night. In early infancy, this rhythm is immature, so a newborn may sleep in short, irregular periods […]

Sleep Pressure and Why Babies Become Tired

Sleep Pressure and Why Babies Become Tired

What sleep pressure means Sleep pressure, also called the homeostatic sleep drive, is the body’s internal tendency to seek sleep after time spent awake. It is not a single sensation or a simple countdown. It reflects the combined effects of neural activity, energy use, biochemical signaling, and the restorative functions associated with sleep. During wakefulness, […]