I went from 10+ and being tired to 6-7 hours and being fully awake. Though i'm not sure how your body will function on only 4.5. You do need sleep. But if you want to improve the quality of sleep you get try this for a few months. Stop drinking caffinee entirely. Caffinee is a sleep inhibiter and for me it prevented me from getting good deep sleeps. Even if I didn't drink it for many hours before going to bed there was still caffinee in my body. So try this for a month or 2 (it may be hard if you are addicted like I was). Just get rid of it completly.
It is funny how the thing that I was using to wake me up throughout the day is the very thing that made me tired all the time.
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