Two wake anchors
Use one wake time for Monday–Friday and another for Saturday–Sunday. Each day gets its own calculated bedtime.
Seven-day sleep planner
Compare weekday and weekend wake times, see weekend schedule drift, and export a seven-day plan.
Build a seven-day sleep plan
Device timezone: detecting…. Five-cycle planning estimate using your selected latency.
Your seven-day plan
Times use your device’s local clock.
Weekday bedtime—
Weekend bedtime—
Weekend wake shift—
Sleep opportunity—
What this adds that a one-night calculator cannot.
The interesting problem is rarely one bedtime. It is the transition between Friday, Saturday, Sunday and Monday.
Weekend drift
See how much later or earlier your weekend wake time is, rather than guessing why Monday feels different.
One exportable plan
Download seven calendar events and keep the whole week visible instead of recalculating every night.
Why plan the whole week?
A one-night calculator answers “what time should I sleep tonight?” A week planner answers a more useful question: “Can I repeat this schedule without making Monday miserable?”
The difference between weekday and weekend wake times is sometimes called social jet lag. The term is a shorthand, not a diagnosis. It simply highlights that a large shift between the two parts of the week can make the return to a weekday schedule harder for some people.
What the tool calculates
For each day, Sandy uses five complete cycles, your selected cycle length and your usual sleep latency. The result is a bedtime and wake-up time. The summary shows the first weekday bedtime, the first weekend bedtime, the difference between your wake times and the total sleep opportunity in the week.
What it does not do
- It does not measure actual sleep stages or sleep quality.
- It does not diagnose social jet lag, insomnia or another sleep condition.
- It does not account for shift work, travel or changing schedules. Those are separate future tools.
- It does not replace professional advice for persistent sleep problems.
Use the plan as a starting point. If the weekend shift is large, try moving Sunday's wake time partway toward the weekday time instead of making a sudden change on Monday morning.
Return to the one-night calculator or read how sleep cycles work.