What Is REM Sleep? What Happens And Why It Matters
REM sleep is the stage of sleep with rapid eye movements, a very active brain and most of your vivid …
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.
How Late To Eat Before Bed: What The Research Shows
Quick Answer: If you get heartburn at night, stop eating at least 3 hours before lying down. For everyone else, …
Sleep Regularity: Why Consistent Timing Matters
Quick Answer: Sleep regularity is how consistent your sleep and wake times are from day to day. In a UK …
Social Jet Lag: What It Is And What The Research Shows
Quick Answer: Social jet lag is the gap between the sleep your body clock wants and the sleep your schedule …
How To Get More REM Sleep: What The Research Shows
Quick Answer: No study we found shows that deliberately raising REM sleep improves health in healthy adults, and no proven …
How To Get More Deep Sleep: What The Evidence Supports
Quick Answer: No habit is proven to add a set amount of deep sleep, but the best-supported steps improve overall …
Best Time To Wake Up: What Research Says About Timing
Quick Answer: There is no single best clock time to wake up. Research shows natural wake times spread widely across …
20-Minute vs 90-Minute Nap: Which One Should You Take?
Quick Answer: For a quick lift, short is better. In a lab study, a 10 minute nap gave immediate benefits …
Is Hitting Snooze Bad? What The Research Shows
Quick Answer: Hitting snooze is not clearly bad. In a lab study of 31 habitual snoozers, 30 minutes of snoozing …
Biphasic Sleep: Does Split Sleep Work? Research Review
Quick Answer: Biphasic sleep means sleeping in two parts, such as a night sleep plus a nap, or two chunks …