"Zazen is a deep unoccupiedness - not doing anything outwardly, not doing anything inwardly. It is not even meditation because when you meditate you are making some sort of effort, you are trying to do something: chanting a mantra, remembering God, or even remembering yourself.
But these efforts create ripples, these efforts create vibrations and your sitting becomes corrupted. Then your sitting is not innocent. Zazen means: sit, and just sit, nothing else." Osho
"Remember one thing: meditation means awareness. Whatsoever you do with awareness is meditation. Action is not the question, but the quality that you bring to your action.
Walking can be a meditation if you walk alertly. Sitting can be a meditation if you sit alertly. Listening to the birds can be a meditation if you listen with awareness. Just listening to the inner noise of your mind can be a meditation if you remain alert and watchful.
The whole point is: one should not move in sleep. Then whatsoever you do is meditation." Osho