Binaural induced astral projection

So, this is my second purposeful projection I have done. The first one was awhile back and I just assumed I wasn't focused enough or I didn't project. This time I relaxed and listened to the binaural, it was 20 minutes long. With in about 5 minutes or less my entire body was tingling but like it got cold really fast way and you shiver for a quick second but it felt really good. The weird part was I felt my mouth open the entire time and I'm almost certain I seen my own face for a split second. Then it went dark no sound no light not anything, I believe an absolute void. I suprisingly woke up very energized and back to my normal self. It had been a very emotionally draining last few weeks. The biggest question I have is, why do I read posts about people being energy drained after a projection and they had color and lights ect and I'm quite the opposite. I honestly didn't guard myself as much as I should have, I'm mostly guarded anyway. I'm interested in your thoughts. Thanks!