Meditation can help sleep to become more effective. It can help us to sleep deeper. In a very short period of time, one can refresh one 5 awareness through meditation and allow us to make the most of our time of sleep. Together with meditation, sleep can be minimized.
However, there are still some people in my experience who require no sleep at all, but only need meditation to keep their body and mind refreshed all the time. Even the Lord Buddha himself spent four hours asleep each night. However, there were some of his disciples who spent most of their time during the night contemplating in meditation without going to bed.
In true meditation, the object of concentration is inside the body and the more you meditate, the more the self-awareness increases.
