False start

A false start refers to a pattern in which a baby who has settled for the night wakes — often crying — after a short period, typically 20 to 45 minutes into the sleep period. This timing corresponds with the completion of the first infant sleep cycle, at which point the baby transitions out of the initial active (REM) phase and may rouse to wakefulness rather than cycling into deeper sleep. The term is used in child-sleep and parenting contexts but is not a defined clinical entity.

Why do false starts happen?

False starts are closely related to the architecture of the infant sleep cycle. Because babies enter light, active (REM) sleep first — lasting around 20 minutes — and then transition into deeper quiet sleep, they are particularly vulnerable to waking at the boundary between these stages. If a baby has been fed, rocked, or held to sleep, they may surface from light sleep expecting the same conditions to be present, and fully wake when they are not. Overtiredness, an inappropriate timing of bedtime, or a temporary developmental change can each make false starts more likely.

Is a false start the same as a sleep regression?

False starts and sleep regressions are distinct, though they can overlap. A false start refers specifically to a brief early waking on a given night. A sleep regression describes a broader, more sustained period of disturbed sleep often associated with a developmental change. False starts may become more frequent during a period of developmental disruption.

Is false start a clinical term?

False start is not a term defined in NHS, NICE, or Lullaby Trust clinical guidance. It is a descriptive expression used in parenting and sleep-practice contexts to identify this specific pattern of early night waking.