How do i control sleep,in order to increase my readings at night?

U need to develop biphasic sleeping habits. You will gain more energy and sleep less.

Take a 2 hour nap at about 5 pm everyday. Then sleep at about 12 and wake up at four.

You will need a couple of weeks for your body to adapt to the new sleep schedule but after you adapt. You will sleep less and read more. Or whatever you choose to do with your extra time.

@poster
you need 8hrs of sleep per day to fully recharge your batteries. anything less than that will have you not at 100% (although functioning) SO unless you get rid of some of your daily activities, cutting on your sleep is only going to make it worse because your mind wont be at its full potential.
of course, many people who only sleep 4hrs per day (everyday) will tell you that they "feel" perfectly fine, while deep down they aint.