SLEEP SCIENCE

Engineer your rest

A pharmacokinetic sleep studio. Layered with personalized caffeine half-life math, Widmark BAC modeling, and an architecture index that respects your physiology — not generic averages.

5hr Caffeine T½

50+ Substances

100% Private

Your physiology

Personal Profile

Weight (lbs) *

Biological Sex *

Target Bedtime *

Age

Caffeine Metabolism (CYP1A2)

Stomach State (when drinking)

Personalized for your physiology — settings stay in your browser.

Consumption log

Today's Intake

Impact analysis

Sleep Architecture Forecast

Caffeine at Bedtime 0 mg

BAC at Bedtime 0.000%

SLEEP SCIENCE

Sleep is the foundation

Recovery, focus, hormones, longevity — everything compounds on top of how well you sleep tonight. Pair this calculator with the wider longevity stack and start treating bedtime like the keystone habit it is.

Read Wellness Research Explore the Longevity Lab

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Trusted Tools & Services

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Affiliate Disclosure: Some of the links below are affiliate links. If you click through and make a purchase or sign up, I may earn a commission at no additional cost to you. I only recommend products I personally use and believe in.

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