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I'm a CS master student I'm trying to change my sleeping habits. I used to wake up 9 am everyday, but now I want to change that to start waking up at 6am. I have some friends who wake up at 5 or even 4 and they wake up completely fresh and they start doing their homeworks and study and code.

In my first day I woke up completely fresh and started working fluently. Today is my second day, however I feel sleepy and unable to completely focus on reading papers or writing code. Is this going to continue like this? Or is my body going to change? Because I want to wake up at 6am as if I woke up 9 am and get the same feeling of sleep-satisfaction. Although yesterday I slept at 10:30 and today I woke up at 7am but I'm still not satisfied and feeling sleepy. So what's wrong?

EDIT: I don't drink coffee at all. I only drink green tea and mint. As I'm now working on my thesis so I don't have courses or need to go to the uni, i.e. I work at home. So I wake up at 9am usually, take a shower and get a very light break fast, then do some web browsing to have my brain get alert and awake. That process takes about 1 hour after I wake up. After that I start working on my thesis for couple hours (of course I take slight breaks of 15 minutes) and then at 2pm I usually eat my lunch. I take 1 hour break after lunch because I can't work directly after eating. Then I return to working at 3 or 3:30pm until like 8pm. Of course I also take breaks during that time. Sometimes I work until 9 or 10, but if that happens it means that I took too much breaks. Because I feel guilty then I work until 10 or even 11 or even 12 or 1 am. After that I sleep and the process continues.

Sometimes because of this routine there are days when I can't work at all. Like I start my day and say yes I will work after an hour but that never happens and I keep doing this and end up just wasting the entire day without really having a fun day or doing any work. I also work on weekends (expected since I'm a master student). Sometimes I go jogging for 2kilometers. Also I like to walk a lot.

I think I have a bad routine but that's mainly because I don't have a stable life at the moment because of my thesis. It's a very tough and stressful period. Also I feel guilty if I don't take up the entire day for working. :/

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Alex, you need to tell a lot more about your daily and weekly activities/patterns, and general health, for anyone to give a meaningful answer. As it is now your question has insufficient information. Please edit. – Jan Doggen May 9 '14 at 7:02
As a general rule, if you want to wake up 3 hours earlier, you're going to have to get to bed (and to sleep) 3 hours earlier. – Kramii May 9 '14 at 8:54
Don't expect to be able to change sleeping patterns within a few days. Your body has gotten used to a particular sleep/wake and REM sleep pattern, and this will be as hard to change as breaking an addiction to nicotine or caffeine. That said, I suggest pushing your wake-up time back gradually, e.g., by 15 minutes each day. This gives your body time to adjust. Make sure you go to bed early enough, and cut back on the caffeine while you are making the transition. – Stephan Kolassa May 9 '14 at 13:34
@StephanKolassa that is the beginning of a good answer (rather than a comment). – thursdaysgeek May 9 '14 at 16:24
@JanDoggen updated – Jack Twain May 10 '14 at 8:27

Your problem is that you are assumung that your sleeping time should be fixed (as @kramii).

This is a very common mistake between people, you should understand that your sleeping time shouldn't be fixed: you should sleep only when you feel sleepy and wake up at the same time everyday.

Doing this, your body will adapt to this style and you will achieve the desired result.

For more on this topic, please read this:

Once you have read that you will discover the secrets of waking up early.

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