What happens when we sleep

Many biological processes happen during sleep: The brain stores new information and gets rid of toxic waste. Nerve cells communicate and reorganize, which supports healthy brain function. The body repairs cells, restores energy, and releases molecules like hormones and proteins.

Scientists used to think that people were physically and mentally inactive during sleep. But now they know that’s not the case. All night long, your body and brain do quite a bit of work that’s key for your health.

Protection from pressure

Dr Peter Roessler, a fellow of the Australian and New Zealand College of Anaesthetists, agrees. “I think movement while we are asleep is a protective mechanism to prevent problems developing from prolonged pressure — such as reduced blood flow to certain parts of the skin,” he says.

Early neuroscientists assumed that consciousness wanes during sleep because the cortex simply shuts off. But electroencephalography (EEG) and other modern methods have since ruled out that explanation, showing that the electrical chatter and metabolism of neurons in the cortex continues unabated during sleep.

Dreams as memory aides

One widely held theory about the purpose of dreams is that they help you store important memories and things you’ve learned, get rid of unimportant memories, and sort through complicated thoughts and feelings. Research shows that sleep helps store memories.

The answer is, yes, death can be painful. But it is not always—and there are ways to help manage it to ease one’s final days.

Getting enough sleep

Sleep promotes growth and development in children and teenagers. During deep sleep, the body releases the hormones it needs to grow. Getting enough sleep may therefore allow optimal growth.

Our brain during REM sleep is fully active, guzzling as much energy as when we’re awake. REM sleep is ruled by the limbic system—a deep-brain region, the untamed jungle of the mind, where some of our most savage and base instincts arise.

A new study on melatonin hints that it evolved some 700 million years ago. The authors of the study propose that our nightly slumbers evolved from the rise and fall of our tiny oceangoing ancestors, as they swam up to the surface of the sea at twilight and then sank in a sleepy fall through the night.

Height is largely determined by genetics, and most people will not grow taller after age 18. However, proper nutrition during childhood and adolescence can help you maximize your height.

“Leptin is the hormone that tells you to stop eating, and when you are sleep deprived, you have less leptin.” More ghrelin plus less leptin equals weight gain. “You are eating more, plus your metabolism is slower when you are sleep-deprived,” Breus says.

In girls, feet also stop growing around age 20. They usually start puberty earlier, between ages 8 to 13 years old. During this time, a girl’s feet will rapidly grow as she goes through growth spurts. Usually, the rate of foot growth decreases between ages 12 to 13.5 in females.

Girls usually stop growing taller about 2 years after starting their menstrual period. Your genes (the code of information you inherited from your parents) will decide many things during this time, including: your height, your weight, the size of your breasts and even how much hair you have on your body.

The average age for girls to begin puberty is 11, while for boys the average age is 12. But it’s different for everyone, so don’t worry if your child reaches puberty before or after their friends. It’s completely normal for puberty to begin at any point from the ages of 8 to 14.

What can I do to become taller? Taking good care of yourself — eating well, exercising regularly, and getting plenty of rest — is the best way to stay healthy and help your body reach its natural potential. There’s no magic pill for increasing height. In fact, your genes are the major determinant of how tall you’ll be.