HAVIT Blog
Guides fondés sur la science pour les habitudes, le sommeil, la nutrition et le mouvement.
Récents · 62 articles
Can't Sleep After Evening Workout? The Intensity Threshold That Changes Everything
Keep evening workouts below 80% max heart rate and add a 20-minute cooldown to avoid the sympathetic overdrive that keeps you staring at the ceiling.
Scheduled Worry Time: How 15 Minutes Can Stop Racing Thoughts at Bedtime
Setting aside 15 dedicated minutes for worrying earlier in the day can reduce bedtime racing thoughts by over 50%, according to recent cognitive behavioral research.
Revenge Bedtime Procrastination: Why Reclaiming Your Day Is the Only Way to Fix Your Night
Revenge bedtime procrastination stems from lacking daytime autonomy; fixing your day structure eliminates the need for nighttime 'revenge' entirely.
Revenge Bedtime Procrastination: Why You Stay Up Late (And How to Actually Stop)
Revenge bedtime procrastination happens when your brain craves autonomy it didn't get during the day; addressing that need directly is more effective than forcing earlier bedtimes.
Why You Get a Second Wind at Night: The Circadian Alerting Signal Explained
Your late-night energy surge is a biological feature called the circadian alerting signal—and fighting through it is key to protecting your sleep schedule.
Exercise Before Bed: The Timing Window That Actually Matters for Sleep
Moderate exercise 4 hours before bed improves sleep; vigorous workouts need 6+ hours buffer to avoid disruption.
Why Sleeping Less Than 6 Hours Triples Your Chance of Catching a Cold
Getting less than 6 hours of sleep reduces your natural killer cells by 70% and triples your susceptibility to viral infections.
Why Your Grandparents Wake Up at 5 AM: The Science of Sleep Architecture Changes With Age
Sleep architecture naturally shifts with age—less deep sleep, more awakenings, earlier timing—but understanding these changes helps you work with your biology instead of fighting it.
Can You Catch Up on Sleep on Weekends? What 2025 Research Actually Found
Weekend catch-up sleep recovers only 20-30% of accumulated sleep debt, and cognitive deficits persist for up to 7 days even after extended recovery periods.
Sleep Divorce: Why Separate Beds Might Actually Save Your Relationship
Research shows couples with sleep incompatibilities report higher relationship satisfaction after switching to separate beds—when done intentionally.
Sleep Divorce: What Research Actually Says About Separate Beds and Your Relationship
Sleeping separately can improve both sleep quality and relationship satisfaction when done intentionally, though couples lose some synchronization benefits.
Sleep Extension for Athletic Performance: The 10-Hour Protocol That Improved Sprint Times 4%
Extending sleep to 10 hours improved collegiate athletes' sprint times by 4% and free-throw accuracy by 9%—here's how recreational athletes can apply these findings.