According to the National Institute of Health the chart below shows the general recommended amount of sleep by age.
|Age||Recommended Amount of Sleep|
|Newborns||16–18 hours a day|
|Preschool-aged children||11–12 hours a day|
|School-aged children||At least 10 hours a day|
|Teens||9–10 hours a day|
|Adults (including the elderly)||7–8 hours a day|
If you routinely lose sleep or choose to sleep less than needed, the sleep loss adds up. The total sleep lost is called your sleep debt. Some people nap as a way to deal with sleepiness. Naps may provide a short-term boost in alertness and performance. However, napping doesn’t provide all of the other benefits of night-time sleep. Thus, you can’t really make up for lost sleep.
Sleeping more on days off might be a sign that you aren’t getting enough sleep during your work week. Although extra sleep on days off might help you feel better, it can upset your body’s sleep–wake rhythm. Bad sleep habits and long-term sleep loss will affect your health. If you’re worried about whether you’re getting enough sleep, try using a sleep diary for a couple of weeks. Write down how much you sleep each night, how alert and rested you feel in the morning, and how sleepy you feel during the day.