As MorningView said, these are normal sounds you can hear when falling asleep or waking up. Normally, at that point you are very close to a lucid dream.

Sometimes these sounds leak into your dreams and become part of the plot. I had a few dreams that it was very windy outside (this was the sound of the strong wind you sometimes can hear), and once I heard a huge long thunder in a dream (this was also one of the sounds you can experience).

You are probably bocoming more aware of your body because of your studies and meditating.

If you would like to pursue lucid dreaming, check out the DV Academy to see if there is a class you would like to join. happy dreams