We have all experienced different ways of waking up, or different moods let’s say, when we wake up. Sometimes we might sleep for more than 10 hours and still feel tired as if we had been running all night, and sometimes we wake up from a 15 minute nap and feel as good as new. Also, you must know that feeling when you wake up and feel lost in space and time and you need some time to get back to normal. You must have also woken up on your own before the alarm starts and decided to use that little time until the alarm starts for extra sleep. And after that it becomes extremely difficult to wake up. And sometimes, although very rarely at least for me, we wake up rested and in a great mood just like the people in commercials. So, why does this happen?