This report analyzes 38 peer-reviewed studies and workplace performance data from 127,000+ employees to quantify the relationship between sleep and productivity. The findings are unambiguous: workers averaging 7–8 hours of sleep produce 29% more output than those sleeping under 6 hours, a gap worth approximately $2,280 per employee annually. The data also reveals that sleep deprivation costs…

This analysis synthesizes 47 studies and data from 89,000+ students to quantify exactly how sleep affects grades, test scores, and cognitive performance. The findings are consistent across age groups: students sleeping 7–8 hours outperform their sleep-deprived peers by nearly half a GPA point, score 112 points higher on the SAT, and retain 37% more information…

This calculator compares your deep sleep and REM data against age-adjusted benchmarks from clinical research. Sleep architecture shifts significantly with age: a 25-year-old needs 20–25% deep sleep, while a 55-year-old may only need 12–17% to function optimally. Enter your tracker data below to see where you stand and get specific recommendations if either stage is…

Quick Answer: Yes. Untreated sleep apnea increases weight gain risk by 2.0–2.5x through hormonal disruption, metabolic slowdown, and fatigue-driven behavior changes. The relationship is bidirectional: excess weight also worsens apnea severity, creating a reinforcing cycle. In This Analysis Sleep Apnea and Weight: The Statistical Link Large-scale studies consistently show a strong correlation between obstructive sleep…

Quick Answer: Adults need 90–120 minutes of REM sleep per night (20–25% of total sleep). The optimal range varies by age, with younger adults requiring more REM and older adults naturally experiencing less. In This Report REM Sleep Requirements by Age Group REM needs shift significantly across the lifespan, with infants spending nearly half their…

Waking up drenched in sweat can turn a peaceful night into a frustrating experience. If you’re asking yourself “why do I wake up sweating every night,” you’re not alone. Night sweats affect millions of people and can stem from various medical conditions, hormonal changes, or medication side effects. Understanding the reasons for waking up drenched…

Sleep deprivation costs add up to $280-$411 billion annually from the U.S. economy—more than most nations’ entire GDP. You’re paying this hidden tax through higher healthcare costs, reduced wages, dangerous accidents, and productivity losses that ripple through every corner of American business. Key Findings Below you’ll find the verified financial data that reveals just how…

New research reveals the precise timing and intensity of light exposure that either helps or harms your sleep. From morning sunlight that advances your circadian clock to blue light that delays sleep onset by hours, our analysis shows exactly when light works for or against you. These data tables eliminate the guesswork around optimal light…

New research reveals the precise relationship between sleep hours and workplace performance. Our analysis of cognitive testing, productivity studies, and income data shows exactly how much each hour of sleep affects your ability to think, react, and earn. The data tables below make it clear: there’s an optimal sleep zone for peak performance. Key Insights…

Research consistently shows that menopause and sleep are closely linked through multiple biological, psychological, and environmental pathways. This report compiles metrics and trends from peer-reviewed studies to highlight how menopause affects sleep from multiple angles. The goal is to provide evidence-based insight into what disrupts sleep during this life stage, who is most affected, and…