For most people, sleeping is definitely one of their favorite times of the day. In addition to being pleasant, sleep brings health benefits, allowing our body and mind to recharge. Some of us sleep a lot, some sleep little, some fall asleep as soon as they put their head on the pillow, while others need a few extra minutes. This is because not all human beings are the same; both the genetic inheritance that comes to us from our family and the lifestyles of each person influences how much sleep we need, on the sleep and wake cycles, making them tailored to the needs of individuals.
Furthermore, the recommended hours of sleep are very different depending on the life stage you are in. In fact, age is not only one of the most important factors but the one that most influences the hours of sleep needed for each person. For example, a four-year-old child has very intense physical and mental activity. Everything is a stimulus, and for this reason, his sleep needs to be restful and last several hours compared to that of an adult or a teenager, while as age advances, and in particular above 65 years of age, fewer hours may be sufficient.
This shows that, unfortunately, there is no minimum number of hours of sleep that is the same for everyone and scientifically tested that can be recommended without the risk of making mistakes. Each person needs a specific amount of sleep, and there are many factors to take into consideration when determining how many hours of sleep you need to sleep well.
How To Determine How Many Hours Of Sleep Are Necessary?
Indeed, some of us have found ourselves having to forcibly lose a few hours of sleep, perhaps due to some hungry newborns, due to the stress of particularly intense work periods, or trying to prepare for the last exam of the semester in record time. In these cases where you find yourself sleeping less than expected, you have the sensation of having asked your body for a great effort and of finding yourself indebted to Morpheus.
Sleeping is much more for the body than simply recharging the batteries; the hours of sleep are hours that our body uses to reorganize itself, produce substances necessary for the metabolism and immune defenses to regenerate, to order memories in the mnemonic traces on the cerebral cortex. Plus, when we wake up after a good night’s sleep, we are more energetic and peaceful and feel like we can conquer the world.
If the hours of sleep necessary to carry out this nocturnal “pit stop” are not respected, the consequences could materialize in a lack of energy, difficulty concentrating, in short, practically a subsequent working or study day thrown in the bin. On the other hand, be careful, it is not just by sleeping more that we will acquire all these benefits. On the contrary, sleeping too much is just as counterproductive as not sleeping or doing so for only a few hours.
In order for hours of rest to have beneficial effects on our health, two fundamental requirements must be met: on the one hand, the quality of sleep must be reasonable, and there must be no interruptions. On the other hand, the time dedicated to this activity must be adequate for the needs of our body. The right question to ask is, therefore, how many hours to sleep to feel good and wake up rested? Considering that there is no universal answer for everyone, let’s proceed with an analysis of the factors that influence the hours of sleep necessary for each of us.
How Many Hours Should You Sleep Based On Age?
To find an answer to such a specific question, science and research come to our aid. In fact, there are some updated general indications, provided by the National Sleep Foundation, on how many hours to sleep based on age groups and the needs of the human body at each stage of life, as the result of a worldwide study conducted for more than two years. The group provided the ideal number of hours of sleep by age group, as follows:
- Infants (0-3 months): The current recommended duration is 14-17 hours per day; previously it was 12-18 hours.
- Newborns (4-11 months): the recommended duration is 12-15 hours, but the scale is more comprehensive and can vary between 10 and 18 hours.
- Young children (1-2 years): the recommended duration is 11-14 hours, the range is also more comprehensive in this case and goes from 9 to 16 hours.
- Pre-school children (3-5 years): the recommended duration is 10-13 hours, with a broader range of 8 to 14 hours.
- School-age children (6-13 years): the recommended duration is 9-11 hours, with a scale of 7-12 hours.
- Teenagers (14-17 years): the recommended duration is 8-10 hours, with a scale of 7-11 hours.
- Young adults (18-25 years): the recommended duration is 7-9 hours, with a scale of 6-11 hours.
- Adults (26-64 years): the recommended duration is 7-9 hours, with a scale of 6-10 hours.
- Older adults (65+): The recommended duration is 7-8 hours, with a scale of 5-9 hours.
As can be seen from this brief diagram, it would be almost counterproductive for an adult to sleep 5 hours a night because the tolerance scale ranges from 6 to 10 hours; preferably, it would be advisable to sleep between 7 and 9 hours a night, in order to be rested, productive and fit during the following day, and above all to avoid running into health problems associated with prolonged sleep deprivation. The scale provided for each age group also emphasizes individual needs. It is, in fact, advisable for everyone to evaluate the number of hours needed based on their needs, paying attention to how they feel based on the amount of hours they sleep.
Individual Needs In Relation To Recommended Hours Of Sleep
In connection with the study on age and sleep, there are also genetic factors that cannot be changed and which influence the sleep requirement and the time at which one prefers to sleep or fall asleep, and, in general, the feeling of sleep deprivation. For example, a person over 65 may feel the need to go to sleep between 9:00 pm and 10:00 pm, completing the sleep cycle around 4:00 am and 5:00 am. This can lead you to think you suffer from sleep problems when, in reality, you have rested precisely the amount of hours your body requires. Our sleep cycle is also affected by light and darkness.
In bright conditions, the production of a hormone called cortisol increases, which creates a state of alertness, and, at the same time, the hormone melatonin is lowered. Conversely, in the dark, the brain produces more melatonin, which affects sleep by reducing the time it takes to fall asleep. Many students decide to study at night, as they have the false sensation of relaxation, thanks also to the absence of noise and the perception of a dilation of time.
But in reality, a good night’s sleep is essential for memorizing the information learned during the day. It would be much more effective to go to sleep at a reasonable time, rest well, and have more energy to tackle studying in the morning. It is advisable to study in the morning and between midday and four or five in the afternoon. It is in these moments that the brain is best prepared to receive stimuli.
In fact, as the day goes by, it costs us more to assimilate concepts and retain information. Sleep quality, as already mentioned, is a significant factor in determining ideal sleep hours. If your sleep quality is poor, you may need more rest than the study suggests. For these reasons, the sleep cycle is a factor to take into consideration when evaluating how many hours of sleep are needed to sleep well.
How Many Hours Of Deep Sleep iIn A Night?
Our biological clock governs the sleep of each of us. However, there is a sleep cycle that constitutes the rest of each of us and is divided into various phases. The non-REM phase is further divided into three stages:
- Phase 1: falling asleep on average. This phase lasts 7 minutes.
- Phase 2: light sleep, which takes place in the first hours after falling asleep
- Phase 3: deep sleep; this phase and the following represent the most beneficial for the body and typically constitute 20-30% of total sleep.
REM sleep first occurs about 90 minutes after falling asleep and repeats at longer, deeper intervals during the second half of the night, alternating with non-REM stages throughout the night. The duration of deep sleep is, on average, 1 hour and 40 minutes per night; it occurs in cycles lasting about ten minutes, repeated four to six times during the night. Deep sleep occurs more at the beginning of the night and until 4 am. Deep sleep is, therefore, the one that most influences the quality of sleep; it is essential for the correct functioning of the brain, participates in the preservation of memories, and is vital for our immune system.
Hours Of Sleep And Work Productivity: Chronotypes
Some research has highlighted the importance of getting the correct hours of sleep and good quality in order to be productive at work the next day. Workers who have insomnia or do not get adequate hours of sleep are the least productive and most at risk in terms of workplace safety; this is partly linked to a decrease in resources available to be used in requests in the workplace.
The absence of rest influences work abilities that are sought after today, for example, result direction, critical thinking, and horizontal reasoning. Chiefs and leaders who display these abilities on their CVs are then so occupied and depleted from stream slack and gatherings whenever of the day that they see the very mind regions answerable for these errands split the difference.
Assume, as a matter of fact, an intermittent absence of rest can be recuperated. The drawn-out absence of rest, interspersed, for instance, by 17-19 successive long stretches of alertness, implies that singular presentation on a progression of errands is equivalent to that of an individual with a blood liquor level of 0.05%. So, it would be like working during the night at the bar with companions, where cautious choices are seldom made!
What can be done? If just last night you couldn’t sleep a wink before hearing the birds singing if you slept little and badly and would have liked to hit the alarm clock when it went off, if in the office it seems like everyone in the office has set fast forward while you you’re in slow motion… search comes to your aid.
A refreshing afternoon nap, even for a few minutes but without exceeding the 20 minutes that would bring you to the threshold of deep sleep, can help improve attention and cognitive resources, reducing the sense of fatigue and drowsiness during the day. Instead of the usual sandwich during a lunch break, you could give a boost to your energy with a power nap!
Work productivity, in addition to being connected to the total number of hours of sleep, is also connected to the phases of the day in which you sleep. Not all individuals are structured in the same way; there are two different “chronotypes,” that is, two circadian rhythm structures set to sleep better and be productive at other times of the day.
- Lark chronotypes are people who naturally tend to go to sleep early and wake up early; ideal productivity for these people can never be achieved in the late afternoon when resources will already be running low.
- Owl chronotypes are people who tend to stay awake longer at night and wake up later; for these people, a morning job could be an absolute nightmare because they will only really wake up mentally around lunchtime.
As much as the work shift allows, it is essential to try to respect your own pace. For example, try to keep the most complex work or the most difficult topics to study and analyze for those times when you feel more mentally active so as to make better decisions, solve problems faster, and obtain maximum performance.
- Food supplements should not be understood as substitutes for a varied and balanced diet combined with a healthy lifestyle.
- Melatonin contributes to reducing the time required to fall asleep.
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