Psychology of sleeping

Everybody knows that without sleep human organism can't function properly. Sleep is necessary for us. So we should be interested in this activity and take more care of our sleeping quality and quantity. I decided to search more information about sleep and saw that there are so many information about it, that's not easy to talk about everything I've read. So I would like to mention some of the most interesting facts about sleep.
What's interesting, people think that sleep is passive part of our daily live,but in fact while we are sleeping our brains work actively. Also sometimes people think that more you sleep, more energy you get. Really it's just one of the myths of sleeping. That's not true because you don't need 12 or 15 hours to feel actively. The time of sleeping required depends on your age, life conditions and many other facts. Astonishing is that sometimes less sleep means you could feel better.
What's more I found another interesting fact "The more you sleep the more tired you feel".This is true because sleeping makes you lazy. The same example is that if you sit all over the day in front of tv and do nothing more as a result you are feeling lazing. The same thing is while you are sleeping too long.