Those who are keen on exploring more should look up various relaxation methods that fall under the umbrella of Yoga Nidra. The technique described here is generally a preparatory exercise for a following 61 point or 31 point relaxation method (usually done lying down on the back).

As one makes progress in their practice they will find that their body and mind will start experiencing deeper rest for the same or lesser amount of sleep.

Some of the relaxation methods can be done upon waking up too -- gets rid of grogginess.