Changes

(1) by the intensifying of the force of concentration—

(2) by the sleep itself becoming a kind of swapna samadhi in which one is conscious of inner experiences that are not dreams (i.e. the waking consciousness is lost for the time, but it is replaced not by sleep but by an inward conscious state in which one moves in the Supraphysical of the mental or vital being).

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The pressure of sleep is a pressure to go inside and the habit of meditation makes it possible to turn the sleep that comes into a kind of sleep-samadhi in which one is conscious of various experiences and progresses in the inner being.