I stumbled upon a very interesting article about the secretion of Human Growth Hormone (HGH).
You can read it here: Secretion of HGH
What is so important about night sleep isn't how long you sleep, but actually that you take your sleep before midnight.
Because Human Growth Hormone is being release just after midnight in the pituitary gland in your brain. It is all important that you sleep at around 22:00, so that the secretion of HGH takes place a little bit after midnight. Another way to increase HGH is exercise, because it induces the production of adrenaline, nitric oxide, blood lactate, acidity or nerve activity, either individually or together. It is also important to drink plenty of water during exercise as dehydration reduces the secretion of HGH.
HGH is the only solution to reduce body fat and increase muscles. So next time you sleep, think about this.