Good questions. Unfortunately, questions about meditation will elicit different answers depending upon one's definition of meditation. For example: the inward, sense-withdrawing process has a particular name in classical Hindu Yoga, which is 'Pratyahara.' It follows the previous steps of [outer] behavior - the moral ethical Yamas and Niyamas; and the positions and breathing practices - Asana and Pranayama. Pratyahara, sense-withdrawal, is the step before concentration and meditation - Dharana and Dhyana. Lastly is Samadhi, or Enstasy, of which there are several degrees.
In Buddhist Yoga, the delineation is smoother, and the 'Jhanas' are the equivalent of the Samadhis. In Zen, the depth of meditative trance seems not to be as deep as the corresponding Yogic trances, when subjects were tested. Moreover, the 'concentrative, one-pointed meditation' of Yoga is different from the 'expansive' awareness-gathering meditation of Zen or Ch'an. The latter types are applicable to martial arts - we've seen blind martial artists, for example, draw upon this outer awareness which has been developed through meditation. Then again, there is the Vipassana form of Buddhist meditation that simply watches everything as it arise in awareness - each thought and feeling and sensation as well as chirping birds and breezes.
Meditation is NOT like babyhood. This is what Ken Wilber calls the "Pre-Trans Fallacy," which is a very important concept - perhaps his most important. Many Eastern books liken the state of enlightenment to the awareness of the neonate (infant) because they are pre-verbal and perceive things more immediately in the Here and Now. But babies are locked into the Sensory-Motor stage of development. They perceive, but do not comprehend. One must first develop an ego before one can transcend the ego. Ego development for the baby is a body-ego entirely. This body-ego only begins to develop when a baby realizes that biting his blanket doesn't result in pain, while biting his thumb does. Only gradually does the unconscious oneness with the universe begin to put forth a point of ego-consciousness that separates baby from Mother and the rest of the universe. Enlightenment is a highly conscious or superconscious Oneness.
Lots of people with certain specific mental disorders, like Borderline Personality Disorder, are attracted to Buddhism for example. These people do not maintain core values; their personalities (and ethics too sometimes) are changeable in a deep way. One doesn't wake-up one morning and say, "Ya know...I don't believe in God/Marriage/Family etc. anymore." These people have never developed healthy, resiliant egos, and think that they've transcended their's. In a psychotic episode, the ego may fracture, and the consciousness becomes flooded with unconscious processes. This is a horrible experience, not a blissful one.
Meditation is aimed at Trance in Eastern meditation (Samadhis, Satoris, Jhanas, Prajnas, etc.) In Christianity, the term Contemplation is used instead of meditation (which is usually a discursive reading of scripture). Contemplation is aimed as differing degrees of the Unitive State - of Being in Christ. Thus, being in Sahaj Samadhi [Hindu], or being in Christ [Christian] is the state of being in which one Realizes (makes real) one's [comm]union with Ultimate Reality (God, or Atman, etc.)
It was the atheist Freud who referred to mystical, unity experiences as "oceanic experiences," and who relegated the whole of Mankind's highest and most profound experiences to no more than a 'regression to the womb.' Freud did not understand spiritual experience, but forced it to fit his materialistic medical model. Mysticism trancends the Freudian model of consciousness completely. This is what former psychoanalytical psychiatrist Stan Groff discovered after using LSD in his great work.
Sorry for the long post. I'm still on holiday and can afford to ramble 
-------------------- γνῶθι σαὐτόν - Gnothi Seauton - Know Thyself
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