Watching the breathing
"... There is no need to teach all kinds of meditations, just one method I can choose which can be the simplest, easiest, and applicable to all. And just that one method can be spread all over the world. It's what I call witnessing the breath. It is a very simple method."
WHEN: Just in your silent moments when you are sitting or traveling in a train or in a plain.
DURATION: From one or two minutes to as long as you want.
THE MEDITATION: Close your eyes and watch your breath. Going in, you go with it; coming out, you come outward.
"You can do it as many times in the day as is possible - sometimes just for two minutes; sometimes for longer periods. Sometimes you are not feeling sleeping and you are just lying on the bed; don't bother about sleep, just do the method. It will do both jobs; it will give you a deep meditative silence, and just by doing it... you will only know in the morning when you wake up that somewhere sleep came in.
"But the strange thing is, if you meditate and fall into sleep, you will
wake up meditating. That means in a subtle way, in your deep unconscious,
the method continued; you whole night became a meditation. Now that is
the longest period you can get. And your sleep will be of a different quality
- more silent, more relaxed, more rejuvenating. And for six and eight hours
subliminally the witnessing continues. In the morning when you become aware
that you are awake, you will be surprised: you are witnessing your breath."
OSHO. The Last Testament, p. 402, apud The Law of Magic