Best And Worst Sleeping Positions: What Research Shows
Discover the best and worst sleeping positions for a good night’s rest. Learn how your sleep position affects sleep quality and what’s best for you.
Sleep Blog
The Sleep Calculators Online blog covers sleep science, sleep health and practical ways to sleep better. Articles explain how sleep stages and REM sleep work, why trouble falling asleep and waking at night happen, how your body clock shapes when you feel sleepy, and what sleep disorders such as sleep apnea, narcolepsy and restless legs look like.
Updated articles link to the research and health sources behind them, and many pair with a free tool such as the bedtime calculator, the sleep cycle calculator or the sleep debt calculator.
Looking for something specific? Browse sleep guides by topic, all sleep calculators or our pillow reviews. The newest articles are below.
Can’t Sleep? Common Habits That Keep You Awake
Quick Answer: If you can’t sleep, check your habits first. The CDC and NHLBI point to an irregular bedtime, caffeine …
Are Sleep Trackers Accurate? What Validation Studies Show
Wrist and finger sleep trackers are good at telling sleep from wake and at estimating total sleep time. They are …
How Often To Replace A Pillow: What The Evidence Says
Quick Answer: No study has set an exact pillow replacement schedule, and the “every 1 to 3 years” rule you …
How To Choose A Pillow: Height, Fill And Neck Support
Quick Answer: Choose a pillow by height and shape first, fill second. Trials suggest that pillow shape and height change …
Mattress Types Explained: What The Research Shows
Quick Answer: No trial we found shows that foam, latex, innerspring or hybrid is the best mattress material. The research …
The Ideal Sleep Environment: A Room-By-Room Guide
The ideal sleep environment is cool, dark, quiet and well aired, with a mattress and pillow that keep your spine …
Sleep And Mental Health: What The Research Shows
Quick Answer: Poor sleep and mental health problems feed each other. Pooled studies found people with insomnia had about twice …
How Sleep Affects Your Health: A Body-System Guide
Sleep affects almost every system in your body, from the brain and heart to metabolism, immunity and mood. Long-term short …
Sleep Apnea Treatment Options Compared
The main treatment for obstructive sleep apnea is positive airway pressure (PAP), usually CPAP. A mask blows a gentle stream …