A study suggests that fasting for an extended period overnight, potentially around 12 hours, may have benefits for heart health, including improved blood pressure and blood sugar levels. The research indicates that aligning fasting with sleep patterns can have a positive impact on cardiometabolic function during both nighttime and daytime. The specifics of the fasting regimen, such as the exact duration and timing, are not universally agreed upon, with some sources recommending stopping eating a few hours before bedtime.