Sleep: The Master Regulator

In a clean crossover study, children whose sleep was extended by just 30 minutes improved on memory and a sustained-attention task; children restricted by 30 minutes got worse on reaction time. Thirty minutes, measurable in both directions. Sleep extension improves cognition in adults too, roughly half an hour to an hour of added sleep sharpens memory and attention. So this isn't "sleep more, vaguely." It's a dial you can actually turn, and the increment that moves it is small enough to be doable. The athlete version: no serious athlete treats sleep as the thing they sacrifice to fit more in, they treat it as a training input they protect. Here's the trap to name, though: ADHD makes sleep genuinely harder, the delayed clock (next lesson), the "revenge bedtime procrastination," the racing brain at night. So we don't fix sleep by deciding to sleep. We fix it by engineering it, a fixed wake time, a wind-down cue, the screens handled by the environment, not by your 11pm willpower, which doesn't exist. Even a behavioral sleep program built on those basics improved symptoms, sleep, and daily functioning at six months in kids with ADHD, proof the levers are behavioral and external, not a matter of trying to want sleep more.