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.
The Two Hours in the Middle: What the Biphasic Sleep Study Actually Measured
The number is two hours. In 1992, the psychiatrist Thomas Wehr ran an experiment that still anchors almost every serious conversation about biphasic sleep.
Night Eating Syndrome Diagnosis and Definition: What Ten Weeks of CBT Actually Changed
Cognitive behavioral therapy for night eating syndrome spends almost no time on the eating. That is the thing nobody told me before I started, and it is the reason I am writing this.
Why Obstructive Sleep Apnea Gets Worse When Your Nose Is Stuffed
There is a sentence that circulates in sleep clinics and CPAP forums, repeated with the confidence of settled fact: a stuffy nose makes sleep apnea worse.
“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