That is the state of meditation. In that state, you may let your focus point go and experience meditation. People with a serious habit of high body activity may wish to use Tai Chi, an ancient oriental art of moving meditation, to begin their meditation practice. There are many Tai Chi instructors in the United States. The witness is the part of you that looks out through your eyes during your waking life, which observes your dreams and which observes your meditations.
Blue light is the object of that sentence.
It has no obvious substance at all. Yet it sees. In waking life, the witness is also present. Thus, it can see life as a play being enacted for it. From that perspective, even the high drama of our life can have an interest to it beyond the seriousness that usually weighs us down.