When is your brain
at its best today?
Your cognitive peak — peak working memory, processing speed, and executive function — arrives predictably 2–6 hours after waking. Enter your wake time to find your window.
How this is calculated
Cognitive peak is the +2h to +6h window after waking. Your body temperature rises, cortisol levels are at their daily high, and prefrontal cortex function peaks. This is when working memory, processing speed, and inhibitory control are strongest — ideal for your hardest cognitive tasks.
The exact window shifts slightly with chronotype (night owls peak later), but wake time is the most reliable practical predictor for daily planning.
Learn more about cognitive peak →Want to see all 5 energy zones for your full day? Try the Energy Zone Calculator →
See your cognitive peak directly in the browser — all day, automatically.
Add Circadianly — It's FreeWorks with Google Calendar · Offline · No data collected