Sleep guides —
everything you need to sleep better.
Every guide is written by our editorial team, reviewer-vetted for medical accuracy, and linked to the exact tool or product you need to act on it. Free, no signup.
Browse by category
Sleep basics
How sleep actually works — cycles, stages, breathing science, what different age brackets need.
2 guides →
How to sleep better
Practical, action-first guides for adults who want to fix a sleep problem in the next 7 days.
10 guides →
Baby & child sleep
Reviewer-vetted parent guides for newborn through preschool — the ones we send to friends.
5 guides →
Sleep disorders
Insomnia, sleep apnea, restless legs — when to see a doctor and what to do until you can.
2 guides →
Sleep + lifestyle
Jet lag, shift work, travel — for anyone whose sleep gets crushed by their calendar.
1 guide →
Recently updated
Freshness matters — every guide is revisited quarterly.
Sleep cycles explained (90-minute rule)
REM vs deep vs light — what actually happens in each stage and how the 90-minute cycle drives our sleep-cycle calculator.
7 min read
Breathing exercises for sleep
4-7-8, box breathing, and physiological sigh — which one actually works and when to reach for each.
6 min read
Caffeine and sleep
Half-life math, cutoff timing, and why your afternoon coffee still wrecks 3am — pairs with the caffeine-cutoff calculator.
8 min read
Can't fall asleep? Fix it in 7 nights
The exact protocol we use in CBT-i: sleep restriction, stimulus control, and what to do at 3am when you're wired.
10 min read
Why you wake up at 3am
Cortisol, alcohol, blood sugar, or something else — the 5 real causes and the exact test to identify yours.
9 min read
Natural sleep remedies that actually work
Magnesium, glycine, melatonin dosing — what the research says and what to try first.
11 min read
Read → calculate → shop
Every guide links to the free tool that automates the calculation, plus the product page where you can price- compare the recommended gear across 5 retailers.