By : Professor Dr Kaid Johar SR
Department of Zoology, Biomedical Technology and Human Genetics, Gujarat University, Ahmedabad
qaidjohar110@gmail.com; kaidjohar@gujaratuniversity.ac.in
www.daylifenews.in
For a long time, people have heard that eight hours of sleep each night is necessary for good health. As a result, many worry if they get only six or seven hours and wonder whether it might harm their bodies.
But is eight hours really the perfect amount for everyone?
Recent studies show the answer is more complicated. Experts now believe there isn’t one perfect amount of sleep for everyone. Some people feel rested after seven hours, while others need eight or nine.
What matters most is not stressing about getting exactly eight hours every night.
Where Did the Eight-Hour Rule Come From?
The idea of dividing the day into three equal parts—eight hours for work, eight for free time, and eight for sleep—became popular during the industrial era.Over time, this simple split turned into a health guideline. Eight hours of sleep started to be seen as the ideal for all adults.
But people aren’t machines. We all have different ages, lifestyles, health, routines, and body clocks. So it’s not realistic to expect everyone to need the same amount of sleep.
How Did Our Ancestors Sleep?
Scientists have also studied communities whose lifestyles more closely resemble those of early humans. Some hunter-gatherer groups have little access to artificial light, smartphones, TV, or other modern things that can affect sleep.Interestingly, studies show that people in some of these groups often sleep less than eight hours. In some cases, the average is about six to seven hours.They also don’t usually make up for shorter nights by sleeping a lot during the day.However, this doesn’t mean that six hours is enough for everyone.
People in different places have different routines, activity levels, climates, and social habits. So it’s hard to compare their sleep patterns to those of people in modern cities.
So, How Much Sleep Do We Actually Need?
There isn’t one answer that works for everyone.
Studies of large groups show that many adults do well with about seven to nine hours of sleep. Some people may need a little less, while others need more.Age also matters. Young people usually need more sleep than older adults. For example, teenagers need a lot more sleep because their bodies and brains are still growing.Even two healthy people who are the same age might need different amounts of sleep.One person might feel energetic and alert after seven hours, while another might feel tired, cranky, and unable to focus unless they get eight or nine hours.
That’s why you shouldn’t judge your sleep by the clock alone.
Too Little Sleep Can Be a Problem
While the right number of hours is different for everyone, not getting enough sleep regularly is definitely bad for your health.
Not sleeping enough can affect many parts of our lives. It can lead to:
• Difficulty concentrating
• Poor memory
• Lowered alertness
• Mood changes and irritability
• Reduced work performance
• Increased risk of accidents
Not getting enough sleep over a long time has also been linked to several health problems.
So, this doesn’t mean you don’t need much sleep.
Instead, the point is that you need enough sleep for your body and lifestyle.
Can Too Much Sleep Also Be a Concern?
Interestingly, scientists have also noticed that sleeping for very long periods regularly can sometimes be linked to health problems.Studies have found links between unusually long sleep and conditions like heart disease, obesity, stroke, and memory problems.However, an important question remains:
Does sleeping too much cause these problems, or do people sleep longer because they already have a health issue?Scientists are still trying to understand this relationship.Sometimes, sleeping too much is just a sign that something else is wrong. If you’re always tired, need a lot of sleep, or wake up feeling tired even after many hours in bed, it’s worth paying attention.
Sleep Quality Is as Important as Sleep Duration
Think about two people who both spend eight hours in bed.The first person sleeps peacefully and wakes up refreshed.The second person wakes up repeatedly during the night, snores heavily, feels restless and wakes up tired.Even though both spent the same amount of time in bed, their sleep experiences differ greatly. That’s why the quality of your sleep matters just as much as how long you sleep. Sleep should help you wake up feeling refreshed and able to get through your day.
It’s not just about counting hours.
Your Body Has Its Own Clock
Another key factor is when you sleep.
Our bodies have an internal clock that helps control when we feel sleepy and when we feel awake.In the past, sunrise and sunset shaped people’s sleep patterns. Now, artificial lights let us stay active long after it gets dark. Many people now stay up late, wake up early for work or school, and try to make up for it by sleeping longer on weekends.This irregular pattern can throw off your body’s natural rhythm.
That’s why keeping a regular sleep schedule can be just as important as how many hours you sleep.
Don’t Panic After One Bad Night
Almost everyone has a sleepless night now and then.Stress, excitement, work, illness, or family duties can all disrupt our sleep sometimes. It becomes a problem when poor sleep becomes routine.
Instead of worrying every morning about getting exactly eight hours, try asking yourself a few simple questions:
Am I reasonably refreshed when I wake up?
Can I remain alert during the day?
Am I constantly feeling sleepy or exhausted?
Is my sleep regularly disturbed?
Your answers to these questions can tell you more about your sleep health than just looking at the number of hours you slept.
The Bottom Line
The well-known eight-hour sleep rule is a helpful guideline, but it shouldn’t be treated as a strict rule for everyone.Some people feel great after seven hours of sleep, while others need more. Age, health, lifestyle, and your own biology all affect how much sleep you need. A range of around seven to nine hours is usually recommended, rather than one fixed number.
So instead of chasing the perfect number of hours, focus on getting enough good-quality, regular sleep.
Listen to your body.
And most importantly, don’t lose sleep worrying about whether you got exactly eight hours.