Design your day around energy, not just hours
A good daily routine is not about cramming in more — it is about putting the right work in the right hours. Deep work belongs at your energy peak; admin and email belong in the troughs; and the day needs real breaks and a proper wind-down to be sustainable. This builder takes your fixed anchors and your priorities and lays out a complete, time-blocked day.
The science behind energy-based scheduling
Research on cognitive performance across the day consistently shows that mental energy is not constant. Most people experience a primary peak in the late morning, a post-lunch trough in the early-to-mid afternoon, and a secondary (smaller) peak in the late afternoon before declining in the evening. Morning chronotypes — people who rise early and feel sharpest before noon — experience the primary peak earlier and have a sharper decline in the evening. Evening chronotypes show the opposite pattern.
The practical implication is that identical work done at different times of day produces different results. Tasks that require sustained focus, creative problem-solving, complex analysis, or difficult decisions are most efficiently done during the peak. Tasks that are important but cognitively lightweight — responding to messages, scheduling, administrative processing — fit naturally into the trough.
This is not just about comfort. Attempting creative or analytical work during a trough means spending more time on it, making more errors, and deriving less insight than the same work would yield at peak. The planner operationalises this by placing your top priority in the peak window.
How it works
You give the planner four anchors — wake, work start, work end, and bedtime — plus your chronotype and three priorities. It then fills the gaps with blocks. The morning starts with a no-phone wake routine, and if there is enough time, a focus or movement block before work. Inside the work window it places your top priority as a protected peak-focus block: early for morning people, just after lunch for evening people, with meetings and shallow tasks in the lower-energy stretches and a real lunch break in the middle.
After work it schedules a transition into your second priority, dinner and personal time, your third priority if time allows, and a final wind-down hour for screens-off prep. It also computes your sleep window from bedtime to wake and warns you if it drops below seven hours. All times are validated, so out-of-order anchors return a clear message instead of a broken schedule.
Common scheduling mistakes the planner helps avoid
Scheduling meetings at peak time — The easiest meeting slot is often mid-morning, which is the peak time for most chronotypes. Over a week this can consume 10 to 15 hours of optimal cognitive time on coordination work that could happen during the trough. Protecting the peak for solo deep work is the highest-leverage scheduling habit.
No physical transition between work and personal time — Stopping work at 6pm and immediately moving to personal life without a transition block means cortisol and work-related thoughts linger into the evening, degrading both relaxation quality and sleep quality. Even a 15-minute deliberate transition (a short walk, a review of tomorrow, closing all work apps) helps the nervous system shift modes.
Under-sleeping while over-scheduling — A routine that fills every waking hour leaves no buffer, and any overrun cascades into sleep time. The planner flags when the sleep window drops below seven hours because chronic short sleep degrades the cognitive performance the rest of the routine is designed to optimise. Sleep is not a block you compress to fit more in — it is the foundation the other blocks rest on.
Placing all three priorities in the same window — Cognitive switching between different types of work (deep analysis, then creative writing, then strategic planning) each incur a switch cost of 15 to 25 minutes. The planner spaces priorities across different energy windows and minimises same-session context switching.
Tips and notes
Be honest about your chronotype — forcing deep work into the wrong hours wastes your best energy even when the calendar has space. Protect the peak-focus block ruthlessly: no meetings, no notifications, no “quick check” of email or messages. Treat the wind-down as non-negotiable because it determines tomorrow’s sleep quality and therefore tomorrow’s focus capacity. Use this as a default template that you adjust to reality, not a cage — on any given day, swap blocks as needed, but track when you deviate and whether your output reflects it. Everything runs in your browser.