Every sleep consultant talks about wake windows. Almost none explain the thing wake windows are trying to estimate. Sleep pressure is the actual biology of how babies fall asleep. ⠀ 1️⃣ Sleep pressure is the adenosine buildup in your baby’s brain during wake time. The longer they are awake, the more pressure accumulates. When the curve crosses a threshold, they have enough pressure to fall asleep and stay asleep. Below that threshold, they cannot, no matter how dark the room is. ⠀ 2️⃣ Too little