Sleep is a state of rest. During sleep the structures, cells in the body rejuvenate. With enough sleep, the level of concentration increases. The executive faculty of the brain functions well.
When the hours of sleep is not enough, there are some problems associated.
Poor sleep has been linked to a whole range of disorders.
A review of 153 studies with a total of more than five million participants found short sleep was significantly associated with diabetes, high blood pressure, cardiovascular disease, coronary heart disease and obesity.
Studies have shown that depriving people of enough sleep for only a few nights in a row can be enough to put healthy adults into a pre-diabetic state. These moderate levels of sleep deprivation damaged their bodies’ ability to control blood glucose levels.
Vaccines are less effective when we are sleep deprived, and sleep deprivation suppresses our immune system making us more prone to infection.
One study found participants who had fewer than seven hours of sleep were almost three times more likely to develop a cold than those who slept for seven hours or more.
People who don’t sleep enough also appear to produce too much of the hormone ghrelin, associated with feeling hungry, and not enough of the hormone leptin, associated with feeling full, which may contribute to their risk of obesity.
There are also links to brain function and even in the long term to dementia.
Prof O’Mara explains that toxic debris builds up in your brain during the course of the day and waste is drained from the body during sleep. If you don’t sleep enough, you end up in a mildly concussed state, he says.
The impact of sleeping too much is less understood, but we do know it is linked to poorer health including a higher risk of cognitive decline in older adults.
Adapted from BBC