Zdrastvuj and welcome Congrats on your LDs.

Sometimes you hear loud sounds while transitioning into lucid dream through WILD technique. But what you are describing were DILDs. So not sure, what the sound was, could have been part of a dream plot. If you read up on stabilization techniques here in DV Wiki, it will give you ideas, how to stay in your dreams longer. But don't worry, first ones are usually short. To all the great suggestions you were given here (MILD for DILD, DJ, reality checks), I would add you practice daytime awareness http://www.dreamviews.com/f49/sat-sp...puffin-100798/.

Happy dreams