Reader Tool — Chapter 5

Your Peak Window Calculator

Eight questions. Your chronotype. A personalised day map showing exactly when to place your most consequential decisions.

Wake time 0%
Before we begin

What time do you typically wake?

Your day map anchors to your actual wake time. Enter the time you wake on a typical working day — alarm or otherwise.

Your Chronotype

How to use your results

Your day map uses three decision categories. Each one matches a type of decision to the cognitive resources it actually requires.

A
Peak window
Irreversible or high-consequence. Capital allocation, key hires, strategic partnerships, difficult conversations. Once made, these constrain future options.
B
Secondary window
Meaningful but adjustable. Project timelines, resource allocation, vendor selection, proposal review. These matter and can be revised when new information arrives.
C
Valley window
Low-consequence or easily reversed. Email, scheduling, minor approvals, administrative tasks. These require the least from your judgment and belong in your lowest-capacity hours.
Your cognitive day

Cognitive capacity across your waking hours. Place your most consequential decisions at the top of the curve.

HIGH LOW
Category A — Peak
Category B — Secondary
Category C — Valley
Recovery
Monday morning protocol
Next step

Build the full protocol around your windows.

The Peak Window Calculator maps your schedule. Get your Brain Fitness Score, personalised protocol, track your performance and access the Vault. Ready to go deeper with 129 biomarkers? Work directly with Ela.