What is the best time to go to sleep?
If you feel exhausted despite sleeping for many hours, the problem may lie less in the number of hours and more in the timing and consistency of your sleep from night to night. Sleep experts and neurologists emphasize that there is no one-size-fits-all bedtime; rather, the ideal timing depends on each person’s internal biological clock, which is shaped by genetics, daily habits, and environmental factors. However, what is scientifically established is that maintaining a consistent sleep and wake time every day—even on weekends—is the most decisive factor in sleep quality and daytime energy levels.
Dr. Eric Chou of Harvard University explains that the brain operates according to a circadian rhythm that regulates sleep and wakefulness, and that the best approach is to find a schedule that aligns with this natural rhythm, allowing you to obtain sufficient, uninterrupted sleep consistently. Dr. Nishi Popal adds that the brain thrives on regularity, and adhering to a fixed sleep schedule is one of the best things you can do for your energy and overall health. It improves mood and concentration, strengthens the immune system, and reduces the risk of chronic diseases such as diabetes and heart disease. She recommends looking at the time you need to wake up each day—whether for work, study, or family commitments—and then setting a bedtime that allows for seven to nine hours of sleep, which is the optimal duration for most adults according to the American Academy of Sleep Medicine.
• “Early birds” are those who prefer going to bed early (before 10 p.m.) and waking up early (before 6 a.m.), accounting for about 15 percent of the population.
• “Night owls” feel their best when they go to bed late—often after midnight—and wake up late in the morning, representing about 20 percent of the population.
• The middle group, which makes up the majority of the population (about 65 percent), has greater flexibility in sleep timing, but consistency remains essential.
• Exercise regularly, preferably in the morning or afternoon, and avoid strenuous workouts at least two hours before bedtime.
• Limit stimulants such as caffeine and nicotine in the evening, and avoid heavy meals before sleep.
• Maintain a consistent amount of sleep each day; sleeping less than seven hours leads to cumulative sleep deprivation over time, resulting in impaired cognitive performance.
Experts warn that waking up multiple times during the night or staying awake for long periods in the middle of the night is unhealthy, even if the total sleep duration reaches eight hours. Sleep quality is just as important as quantity, and continuous deep sleep enables the body to carry out cellular repair, enhance memory, and strengthen immunity. They also recommend establishing a relaxing evening routine an hour before bedtime—such as reading a book, taking a warm shower, or practicing meditation—to prepare the mind and body for deep sleep.
