Britney Spears, the famed singer who got back up the horse and brought the world songs like "Oops, I Did it Again," actually did it again - stay fit with regular exercise. But more importantly, through sleep and staying hydrated, because little do people know, getting enough sleep and drinking water can significantly help a person's health, especially in losing weight.

According to Spears, she's very big on being healthy and working out three times a week in taking care of her body. But she also drinks lots of water to keep her body hydrated and goes to bed early to get her beauty sleep, ContactMusic.com reported.

Everyone knows that in staying fit and healthy, working out is the way to go. However, as the "Circus" singer has testified, staying hydrated and getting enough sleep is key. In fact, aside from its many benefits, getting enough water and sleep could significantly help a person lose weight.

Why Britney is Staying Hydrated

The body basically runs on water and depends on it for survival as every cell needs it to function. Water is also responsible for maintaining its temperature, as well as in removing waste and in lubricating joints - which in overall, suggests water's importance to everyone, according to FamilyDoctor.org.

But for those who want to be in shape, drinking water could be the answer in shedding off pounds. According to MyWeightLifting.com, several different factors that come with being hydrated give it its fat-burning qualities.

For one, getting enough water in the body increases the metabolism of fat. Because the liver and the kidney, which is responsible for metabolizing body fat and filtering waste and toxins, needs proper hydration to do its work effectively. And with that in mind, when burning fat, more toxins are flushed away from our body thanks to water.

Not only that, drinking water can also reduce food cravings and the odds of overeating because it can fill a person up, like everything that is consumed. But more importantly, the lack of water can actually add extra pounds due to water retention; this is because when lacking hydration the body does not know when it will receive water again.

That being said, people should consider having a bottle of water with them daily, in addition to starting and ending the day with a glass.

Why Britney is Sleeping Early

Aside from feeling rested, getting enough sleep can do wonder for the body. According to the Harvard Women's Health Watch, sleeping helps the brain in terms of learning and memory, as it gives the brain a chance to rejuvenate.

Sleeping can also promote good health as it prevents the body from getting too stressed and the immune system functioning properly. Findings also show that sleeping at night helps produce melatonin, a hormone responsible for sleepiness, which suppresses the growth of tumors, Mark Stibich, PhD of About.com reported.

But for stars like Spears who are constantly under scrutiny of the public eye, the fact that sleep can help lose weight is why it's called beauty rest.

Simply put, the lack of sleep makes a person feel hungry even when full. This is because lack of sleep affects the secretion of a hormone, called cortisol, which regulates appetite. Lack of sleep also interferes with the body's ability to metabolize carbohydrates, leading to high levels of blood sugar, according WebMD.

That is why it's important to get between 7 and 9 hours of sleep every night. And for those who cannot sleep at night properly, try avoiding caffeine, nicotine, and alcohol in the late afternoon and evening. It also helps not to have a heavy meal at night and to avoid taking naps within the day to feel sleepy when night comes.