While the amount of sleep individuals need can vary, one cannot change how much sleep he needs and still be at optimal health. Many older people will tell you that over the course of their life, they gradually slept less and less. This is not natural nor healthy. They simply have become accustomed to being perpetually short on sleep. Just because you seem to get through your day, that does not mean your health and performance at everything you do are not being affected.
Interesting. I worked for a guy who used to say he didnt need that much sleep. He was a lot like you described. But he also drank a shit load of coffee so who knows if he was just playing the "i'm tough" role?
I personally must have the testosterone levels of a eunuch because I need at least 9 hours to feel right.
Gradually decrease the amount of sleep you get each night, or just cut the # of hours you sleep to whatever # you want it to be at and you should be accustomed to it within a month.
Less time sleeping means more time awake accomplishing things. For those of us who have concerns in life besides our recovery and matters of the body, this is a valuable asset. Time is invaluable.
A lot of the world's most succesful people didn't sleep a lot, less sleep usually means more work. I'm all for sleep and I sleep 10 hours a day in the summer, but sleeping less usually leads to more productivity during the day assuming the quality of what you do does not go down.
I often feel the same way and I don't drink many caffeinated beverages. If I sleep over 9 hours I usually feel very tired in the morning, as if I had slept for less than 5. On another note, how you feel initially after waking up has a lot to do with what stage of sleep you were in and how rapidly you get up.
That is why waking up naturally feels so good (ideal phase of sleep and usually pretty slowly).
You may want to do a bit more research on that (only if you honestly give a shit though). I have heard of studies (I cannot reference them but someone else may be able to) that indicate that sleeping too much is as bad as not sleeping enough. I assume that it was talking about chronic over sleeping, and not just the odd 10 hour night here or there.
I have went long periods of time with no sleep. It sucks. You don't learn to get used to it anymore than you learn to get used to being cold or hungry. It always sucks. When things die down you start to drone, people fall asleep walking, and everyone generally becomes an ass.
That being said, you can go without sleep for quite a while and still acomplish task that you are well trained at.