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A wave of new research warns that exercising too late in the day—especially if it’s high-intensity—could be robbing you of restorative sleep. As more Thais embrace fitness culture and nighttime gyms gain popularity in Bangkok and beyond, a landmark study of nearly 15,000 people has highlighted how the timing and intensity of your evening workout could be the culprit behind tossing, turning, and groggy mornings (Fortune, Nature Communications). For many, it’s a challenge to find gym time amid work, family, and Bangkok’s notorious traffic jams, pushing workouts close to bedtime. But these new findings have direct and important implications for health-conscious Thais.

A major international study warns that late-evening, high-intensity workouts can disrupt restorative sleep. As fitness culture grows in Thailand and nighttime gyms multiply in Bangkok and beyond, new findings suggest finishing exercise too close to bedtime may cause difficulty winding down and groggy mornings. This matters for busy Thai professionals, students, and families juggling work, commuting, and social obligations.

Regular physical activity remains a cornerstone of health, endorsed by doctors and Thailand’s Ministry of Public Health for its role in reducing disease risk, boosting mood, and supporting sleep. Yet the latest research from Monash University challenges the blanket “any exercise is good” mantra when sleep is the goal. The study followed nearly 15,000 adults using fitness trackers over a year, analyzing millions of nights of data. The key message: completing high-intensity workouts within four hours of sleep correlates with later sleep onset, shorter duration, and poorer sleep quality. Lighter activities such as walking or stretching, if done late, showed less impact on sleep.