Popular Articles
Sleep
05.11.2026
Deep Sleep Estimates: EEG vs Consumer Sensors
Deep sleep estimates try to translate brain and body signals into a nightly score for sleep stages. This matters for people tracking insomnia, recovery, shift work, or training schedules who want to understand what “deep sleep” means and how reliable different devices are. This article explains how EEG-based staging differs from consumer wearables, why estimates can drift, how to interpret trends, and what checks improve confidence. You’ll also find realistic scenarios, a comparison checklist, and common mistakes to avoid.
Sleep
28.10.2026
Circadian Phase: DLMO vs Sleep Timing
Circadian phase describes where your internal body clock sits relative to the day-night cycle. This article compares DLMO (dim light melatonin onset) with sleep timing, two common ways people try to judge circadian timing. It explains what each measure reflects, why they can disagree, and how light exposure and schedules shift the body clock. You’ll learn practical ways to interpret results, reduce common measurement errors, and decide what to track next.
Sleep
24.10.2026
Bedroom Temperature: What Controlled Trials Measure
Bedroom temperature affects sleep, comfort, and next-day functioning. This article explains what controlled trials actually measure when researchers change room temperature, including sleep onset, total sleep time, awakenings, and thermoregulation. It also covers common misunderstandings, such as confusing “cooler” with “colder,” and how bedding, humidity, and airflow change the results. Readers will learn how to interpret trial outcomes and how to choose a practical temperature range for their own bedroom.
Sleep
20.10.2026
Sleep Efficiency: Formula, Range and Measurement Error
Sleep efficiency is a sleep-tracking metric that compares time asleep with time spent in bed. It helps people understand whether they are lying awake for long stretches, even when they get a similar total sleep time. This article explains the sleep efficiency formula, typical ranges, and how measurement error from wearables and sleep logs can shift the number. You will learn practical ways to measure it more accurately, interpret patterns over time, and avoid common mistakes.
Sleep
14.10.2026
Sleep Tracker Accuracy: PSG vs Consumer Wearables
Sleep trackers help people estimate sleep duration, timing, and rest quality, but accuracy varies widely. This article compares consumer wearables with polysomnography (PSG), the clinical reference test. It explains why devices disagree, what each method can and cannot measure, and how to interpret common metrics like sleep stages and awakenings. You’ll learn practical steps to validate readings, reduce measurement errors, and decide when a sleep study may be worth discussing with a clinician.
Sleep
08.10.2026
Caffeine Half-Life: Timing and Sleep Impact
Caffeine half-life describes how long it takes for your body to remove half of a caffeine dose. This matters for sleep timing because caffeine can still affect alertness, heart rate, and perceived sleep quality hours after drinking coffee or tea. This article explains typical half-life ranges, why they vary, how timing changes sleep outcomes, and what practical schedules and tracking steps can help you reduce late-day caffeine effects.
Sleep
02.10.2026
Bedroom Temperature: What Studies Actually Measure
Bedroom temperature affects sleep comfort, breathing, and next-day functioning, but many articles treat “the ideal temperature” as a single number. This guide explains what temperature studies actually measure, how they define “bedroom,” and why results differ across people and seasons. You’ll learn how to interpret common findings, what to measure at home, and how to avoid misleading conclusions from lab-style or short-term studies.
Sleep
26.09.2026
Naps: 20 vs 60 vs 90 Minutes Compared
Naps can help with alertness, but timing changes what sleep stages you reach. This article compares 20, 60, and 90 minute naps using sleep-cycle biology, including sleep inertia and how long grogginess may last. It’s for people who nap for work, study, shift schedules, or recovery from short sleep. You’ll learn what each nap length tends to do, who should be cautious, and how to choose a practical nap plan.
Sleep
20.09.2026
Sleep Regularity: Why Timing May Matter
Sleep regularity focuses on keeping consistent sleep and wake times. This guide explains how timing affects circadian rhythms, sleep pressure, and next-day alertness, with practical examples for travelers and shift workers. You’ll learn common mistakes that disrupt timing, how to plan a schedule change safely, and what to track using simple tools. The article also includes educational scenarios, a decision checklist, and a short FAQ for readers searching for evidence-based guidance.
Sleep
14.09.2026
Circadian Phase: Light Timing vs Sleep Timing
Circadian phase depends on when the brain receives light and when the body sleeps. This article explains how light timing and sleep timing can shift the internal clock in different directions, why common schedules create jet-lag-like effects, and how to plan changes using practical steps. It’s for people adjusting shift work, weekend sleep, or travel schedules who want to understand what to track and what trade-offs to expect.