Must people sleep 8 hours a day? Research from the American Cancer Society indicates that individuals averaging 7–8 hours of sleep per night tend to live the longest, while 80% of those averaging less than 4 hours per night have shorter lifespans. However, Guo Xiheng, Director of the Sleep and Respiratory Disease Center at Beijing Chaoyang Hospital, also points out that optimal sleep duration varies by age group and should be determined scientifically based on one's age.
Seniors over 60: 5.5–7 hours daily
Seniors should sleep before midnight, with 7 hours—or even 5.5 hours—sufficient. Alzheimer's Association data indicates that limiting nightly sleep to under 7 hours can delay brain aging by 2 years.Conversely, consistently sleeping more than 7 hours or too little can impair attention, potentially lead to dementia, and increase the risk of premature death.
Recommendations: The most common sleep issues among the elderly are vivid dreams and insomnia. Vivid dreams result from declining brain function, while insomnia is often caused by reduced melatonin secretion—a key hormone regulating sleep.Guo Xiheng advises that seniors with poor nighttime sleep should develop a habit of taking afternoon naps, limited to no more than one hour. Otherwise, the central nervous system may deepen its inhibitory state, reducing cerebral blood flow and slowing metabolism. This can lead to discomfort upon waking or even increased drowsiness.
Adults aged 30–60: Approximately 7 hours of sleep daily
Adult men require about 6.49 hours of sleep, while women need around 7.5 hours. It is crucial to ensure "high-quality sleep time" between 10 p.m. and 5 a.m.This period facilitates deep sleep, which is crucial for fatigue recovery. A 22-year Finnish study tracking 21,000 adults found that men sleeping less than 7 hours had a 26% higher mortality risk than those sleeping 7–8 hours, while women faced a 21% higher risk. Conversely, men sleeping over 8 hours had a 24% higher mortality risk than those sleeping 7–8 hours, and women faced a 17% higher risk.
Recommendation: Sleep deprivation in this age group often stems from cognitive decline or unhealthy habits like stress-induced overeating. Guo Xiheng advises that besides managing stress, improving sleep environments—such as reducing noise, ensuring ventilation, and blocking light—can help. Choose pillows 10–15 cm high with medium firmness.Those still feeling sleep-deprived can compensate with a one-hour afternoon nap.
13–29 Year Olds: Aim for 8 Hours Daily
Adolescents in this age group typically require about 8 hours of sleep per day. They should adhere to an early-to-bed, early-to-rise routine to ensure deep sleep begins around 3 a.m.Aim to be in bed by midnight and rise by 6 a.m. on weekdays, avoiding oversleeping on weekends. Excessive sleep disrupts the body's circadian rhythm, leading to lethargy, impaired memory, and skipped breakfasts that cause dietary irregularities.
Recommendation: Young people often develop a habit of staying up late, which directly impacts their mental state the next day and can damage skin, leading to acne, pimples, and melasma. Chronic sleep deprivation also disrupts endocrine function, weakens immunity, and increases susceptibility to colds, gastrointestinal infections, allergies, as well as mental symptoms like forgetfulness, irritability, and anxiety.Therefore, young people should prioritize regulating their lifestyle: avoid eating within an hour before bedtime and take a 30-minute nap at noon for optimal health. Children Aged 4–12: 10–12 Hours Daily Children aged 4–10 require 12 hours of sleep daily, ideally going to bed around 8 PM and taking a short nap at noon. Older children may need 10 hours or even 8 hours.Dr. Li Haiying, Deputy Chief Physician at the Capital Institute of Pediatrics' Child Health Department, explained that insufficient sleep not only causes lethargy and weakened immunity but also impedes growth and development. However, she cautioned that excessive sleep—exceeding 12 hours—may lead to obesity.
Recommendations: Children rarely experience sleep disorders; creating a conducive environment suffices. Avoid eating before bedtime, and eliminate overly bright lights or stimulating music in the bedroom. Establish a consistent schedule with your child and encourage adherence to bedtime routines. Have children perform preparatory tasks like brushing teeth, washing faces, and making beds before sleep—these simple actions signal to them that it's time to rest.
1–3-year-olds: 12 hours nightly, plus 2–3 hours daytime naps
Toddlers require 12 hours of nighttime sleep daily, supplemented by 2–3 hours of daytime rest. Specific nap times can follow their natural rhythms—some children naturally nap around midday and again in the late afternoon.Sometimes they enter a sleep state while their minds remain active; even when asleep, they may grind teeth, kick off blankets, or experience bedwetting. These issues can impact brain and physical development. Therefore, parents are advised to give their child a warm bath one hour before bedtime to relax the body. Reading a short story or playing gentle, soothing music can also aid sleep.
Infants under 1 year old: 16 hours daily
Infants under 1 year require the most sleep, approximately 16 hours daily. Sleep is a crucial period for growth and development in young infants, so adequate sleep duration must be ensured.Parents should ensure adequate calcium supplementation and follow scientific feeding practices. Additionally, strive to maintain uninterrupted nighttime sleep by minimizing frequent night feedings or diaper changes, especially during the latter half of the night, as hormone secretion peaks during this period in young infants.
The above provides a brief overview of sleep duration and longevity. We hope this information proves helpful and wish you a pleasant day.