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Sleep Sanctuary & Chronotype Planner

Determine your biological sleep profile, calculate caffeine clearance curves, and configure optimal room temperature/lighting rules to maximize cognitive recovery.

Circadian Chronotype Quiz

Question 1/4

What time would you wake up if you had entirely free time?

Self-Tracking Notice: This circadian schedule calculator is designed for self-tracking, sleep hygiene educational tracking, and chronobiology planning purposes only. It is not medical or diagnostic support for sleep apnea, clinical insomnia, or sleep disorders. Consult a certified clinical somnologist for medical diagnoses.

How This Test Works

1

What It Measures

This planner assesses your subjective fatigue indexes, chronobiology schedules, caffeine half-lives, and sleep environment variables.

2

How Scoring Works

Logic checks integrate circadian chronotypes (Lion, Bear, Wolf, Dolphin) to map optimal alert windows.

What Affects Your Results

Consistent wake times, blue-light exposure, caffeine clearance limits, and bedroom temperatures affect sleep depth.

Want to understand the science? Read our full guide on Rest Science .

Circadian Rhythms and Cognitive Recovery Cycles

Your sleep chronotype determines your peak focus hours. Waking up during deep slow-wave stages results in severe grogginess (sleep inertia), clobbering your reaction times and memory digit spans. Customizing your schedule around 90-minute sleep cycles ensures you awake refreshed, optimization-ready.

Using our sleep schedule optimizer, you calculate precise wind-down targets. Blue-light filtering blocks should be activated at least 2 hours before bed, while bedroom climate limits should stay near 65°F (18°C) to support core body temperature drops.

Explore All Assessments

Explore all 31 cognitive assessments across six domains. Each test runs locally in your browser with sub-millisecond precision.

Reaction & Reflexes

Raw speed & sensory pathways

Memory

Active working capacity & retention

Reasoning

Fluid logic & non-verbal matrices

Focus & Attention

Selective attention & executive suppression

Motor Performance

Spatial mouse control & clicking stamina

Frequently Asked Questions

What is a chronotype?

A chronotype is your body's natural disposition to be awake or asleep at certain times, classified as Lion, Bear, Wolf, or Dolphin.

How does sleep debt affect cognitive scores?

Accumulated sleep debt slows reaction time, degrades working memory capacity, and increases false alarm rates.

What is the circadian rhythm?

The circadian rhythm is a natural, internal process that regulates the sleep-wake cycle, repeating roughly every 24 hours.

How can I improve sleep hygiene?

Maintain a consistent sleep schedule, block blue light before bed, keep your room cool, and avoid caffeine in the afternoon.

Is this calculator a medical tool for insomnia?

No. This is a self-tracking tool for chronotype scheduling and is not a clinical sleep therapy or diagnostic tool.

Why do I feel groggy after 8 hours of sleep?

Waking up mid-cycle (during deep NREM sleep) causes sleep inertia. Syncing wake times with 90-minute sleep cycles reduces grogginess.

How does blue light affect melatonin?

Blue light from screens suppresses melatonin secretion, shifting your circadian phase and delaying sleep onset.

What is the optimal bedroom temperature for sleep?

Ergonomists recommend keeping the bedroom between 60°F and 67°F (15°C to 19°C) to support core body cooling.