Thanks for the replies guys!
PsyDuckmonkey, to answer your question, the similarities I see are these: Both states can produce OBEs, both states involve experiencing seemingly freestanding realities external to consensus reality, both states involve interaction with entities external to oneself. This communication is usually telepathic in nature. Both states are very lucid. Apparent time travel can be experienced in both states, living past lives, childhood memories etc.
Bancopuma, I've also experienced the early stages of astral projection a number of times. I've experienced sleep paralysis a number of times also. For me it's always been a sense of heaviness in the body with pretty intense vibrations in the pineal gland area. Isn't it crazy that the human body can do things like these?
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