Neera team

Insomnia has many causes, from stress and medical conditions to medications and hormones. Here's what causes insomnia, why acute insomnia becomes chronic, and when to see a doctor.

Most deep sleep boosters don't work. Here's what actually increases deep sleep, backed by evidence, from exercise and a cool room to the habits that matter most, plus how much you need.

Core sleep is what Apple Watch calls your light (N1 + N2) sleep, about half your night. Here's what core sleep really means, how it differs from deep sleep, and how much you need.

Most adults need about 90–120 minutes of REM sleep a night (20–25% of total sleep). Learn how much REM sleep you need by age, why it matters, and how to get more.

Narcolepsy is a chronic neurological disorder that disrupts sleep-wake control, causing overwhelming daytime sleepiness. Learn its symptoms, causes, types, and treatment.

Exhausted but wide awake? Here are the most common reasons you can't sleep — from stress and caffeine to hidden health causes — plus what to do right now.

Nervous system regulation explained simply: how to spot a dysregulated nervous system and calm it with practical, evidence-based techniques that actually work.

The best way to track sleep is to combine two layers of information: what you experience and what your device estimates.

A comprehensive guide to why sleep paralysis occurs, what it feels like, when it's harmless, and when repeated episodes require medical attention.

A clear guide to REM sleep: what happens in the brain and body, how much of it adults typically need, what can shorten it, and how to maintain healthier sleep cycles.

Discover how much deep sleep you need for optimal health, how deep sleep changes by age, how it differs from core sleep, and what actually helps you get more restorative rest.

Magnesium has become one of the most talked-about sleep-improving ingredients. Learn more about why.

This guide explains what insomnia is, why it happens, how it is diagnosed, and which treatments have the strongest support.

Sleep score meaning, in plain language: it’s an estimate ofhow restorative your night was — not a diagnosis, and not a moral verdict.

A fact-checked guide to wearable sleep trackers: accuracy, apnea features, Oura vs Apple Watch vs Whoop vs Garmin vs Fitbit, and how to use the data

Sleep hygiene is the set of habits, routines, and environmental choices that support better sleep.

How much sleep do I need? The honest answer is: enough to wake up feeling restored most days

Learn how long a sleep cycle lasts, sleep stages, and how to time sleep to wake up less groggy—plus simple environment fixes.

Improve sleep quality with evidence-based habits, a calming night routine, and clean-bedroom upgrades (light, noise, temperature, air).

To fix your circadian rhythm, anchor it with morning light, a consistent wake time, and well-timed meals

Wake up refreshed with sleep inertia hacks, light timing, a calmer night routine, and clean-bedroom upgrades (noise, light, temperature, air).