Coffee you love.
Sleep you need.
Most advice treats them as enemies. We think they've just been badly introduced. JavaSleep is a slow magazine about the hours between your last sip and your first dream — with honest reviews, quiet science, and one very useful calculator.
How much caffeine
will still be awake
at your bedtime?
Caffeine doesn't clock out when you do. It has a half-life of about five hours, which means your 3 PM latte is still at half strength when you're trying to fall asleep at 11. Here's the honest math.
Adjust the inputs above to see your personal timeline.
Three things worth reading slowly.
Best Travel CPAP Machines (2026): AirMini vs. Transcend Micro vs. Z2 Auto
The best travel CPAP machine for most people is still the ResMed AirMini — if you can tolerate its waterless humidification and proprietary tubing.
What ResMed Quarterly Earnings Actually Say About the Ozempic Threat
In the late summer of 2023, Novo Nordisk released topline results from SELECT, its cardiovascular outcomes trial of semaglutide. ResMed had nothing to do with the study.
Sleep Apnea Treatment Alternatives: What a Mouthpiece Can and Can't Do
There is a machine in a closet somewhere in your house. Hose coiled, mask still faintly smelling of silicone, humidifier chamber gone dry. You used it for maybe eleven nights.
“The most civilized thing a person can do is enjoy a cup of coffee at ten in the morning and still sleep at ten at night.— Editor's Note, Issue №001