HAVIT Blog

Science-backed guides on habits, sleep, nutrition, and movement.

LatestBest Calorie Counter Apps in 2026 (Free and Paid): Every Major App, Reviewed One by OneEvery number in a calorie app is an estimate, so choose on consistency rather than claimed accuracy. Data provenance matters more than database size — and check what happens after the number.

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Why You Forgot Last Night's Dream (And How to Remember More)

Waking during or right after REM sleep makes dream recall more likely—waking gently, staying still for a moment and recording fragments right away helps you catch more dreams without hurting sleep quality.

Foam Rolling: What's Actually Happening When You Roll Out Those Knots

Foam rolling works primarily through your nervous system, not by physically breaking up tissue—and that changes how you should use it.

mTOR Cycling Protocol: How to Build Muscle and Live Longer Without Choosing Sides

Cycling mTOR activation (high protein + lifting) with suppression windows (fasting + lower protein) lets you preserve muscle while capturing longevity benefits—no need to pick a side in the Attia-Sinclair debate.

Isometric Exercise for Blood Pressure: The 8-Minute Protocol Backed by a 270-Trial Meta-Analysis

Isometric exercises like wall sits and handgrip squeezes lowered systolic blood pressure by about 8 mmHg on average—more than aerobic exercise—in a 2023 meta-analysis of 270 trials.

The Ego Depletion Myth: Why Your Willpower Isn't a Battery Running Low

Large preregistered replications found little or no ego-depletion effect; beliefs and motivation seem to shape self-control more than a fixed energy supply.

Alcohol Sleep Disruption Recovery Timeline: Night-by-Night Architecture Repair

Alcohol reduces REM sleep in a dose-dependent way—starting at about two drinks—and fragments the second half of the night. There's no well-established night-by-night recovery timeline, and long-term heavy drinking can disturb sleep long into abstinence.

Insulin Sensitivity: Why Your Morning Toast and Evening Toast Are Not the Same

Your body generally handles the same meal better in the morning than late in the evening, because insulin secretion, insulin sensitivity and glucose tolerance follow a circadian rhythm.

Why Your Body Jerks Awake When You're Falling Asleep (And How to Stop It)

Hypnic jerks are a common, harmless reflex at sleep onset. Caffeine, stress, and sleep debt seem to make them worse, and simple habit changes can help.

Contrast Therapy Hot Cold Protocol: 3:1 vs 1:1 Ratio and What Research Shows for Recovery

Alternate hot (38-40°C) and cold (10-15°C) water in short bouts for up to ~15 minutes, ending cold. Reviews find less soreness than passive rest, but no clear edge over other recovery methods.

Why Your Apple Watch and Garmin Show Different Resting Heart Rates (It's Not a Bug)

Apple Watch and Garmin use different measurement windows and averaging methods, which is why your resting heart rate can differ by several bpm between devices.

Refeeding Syndrome After Extreme Dieting: Warning Signs Your Body Sends When You Start Eating Again

Refeeding syndrome can cause life-threatening electrolyte shifts within 72 hours of resuming normal eating after severe calorie restriction—knowing the warning signs could save your life.

Does Semaglutide Affect Sleep Quality? The Orexin Connection Explained

GLP-1 medications can improve sleep quality primarily through weight loss reducing sleep apnea, though direct brain effects on orexin pathways may also play a role.