Lack of sleep can lead to obesity
Schoolchildren can find it difficult to get back to healthy sleeping habits after a summer of lie-ins.
The evidence shows that night-time sleep is just as important as healthy eating and exercise for children to develop.
Those who don't get enough sleep are more likely to be overweight or obese.
This is because they tend to crave and eat sugary or starchy food during the day to give them energy to stay awake.
The key to how much is enough sleep is whether a child gets up fairly easily in the morning, is alert and happy for most of the day, and is not grumpy.
Experts say that bedrooms are strongly associated with sleep, but that certain things weaken the association.
These include tablet computers, mobiles/smartphones, TVs and other electronic gadgets, light or noise, and a bad mattress or uncomfortable bed. The light from screens can also affect how easily children get to sleep. Try to keep the child's bedroom a screen-free zone and get them to charge their phones elsewhere.
Health & Living