When a baby passes their ideal sleep time, their brain produces cortisol and adrenaline. This makes them appear 'wired' but actually makes them exhausted. The resulting tantrum is an involuntary physical release of that tension.
Transitioning with Ease
Transition anxiety is common around 8-10 months. A simple, 5-minute wind-down routine that is identical every single day provides the predictability a baby needs to feel safe enough to let go of the day.