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.