When I'm on my way out of my body, after the vibration stage, when I can actually feel myself 'lift out', I often hear voices and noises, often not so nice ones - likes screams or growls, which usually scare me back into my body! (although i think that is their intention!).
After doing an on-line course in astral projection I have come to believe that these noises are a mixture of energy buzzes and cracks, our own ego's, and also the odd astral entity now and then.
The best thing to do is just ignore them completely, don't let it have any effect on you or else you will probably end up being zoomed back into your body in a bit of a fright - ruining the whole experience (and, if you anything like me, not projecting for a while afterwards because it scared you! lol)
From what you described, I would say that it is probably a mixture of all the things you heard during the day & your ego's blabbing away. So nothing to worry about

It shows that you're very close to fully projecting into the astral.