Hi Speedie! Welcome to the forum 
Upon falling asleep, it sometimes happens that the body is already asleep, while your mind is still awake. Then you’re entering a state of light trance. This situation is very often accompanied with visual imagery, noises and physical impressions (sinking in your bed, weight upon your chest, vibrations,…). All these effects arise inside your brain. Your physical senses are shut down (the body is already asleep), so practically everything you perceive must come from your own mind. When you perceive these sensations or visuals upon falling asleep, they’re called hypnagogic hallucinations (or hypnagogic imagery in case they’re visuals). When you perceive them upon waking up, which is far more rare, they’re called hypnopompic hallucinations. It’s nothing unusual and it’s part of the sleeping process. The only thing which is rather rare is that you remained conscious. Nothing to worry about 
In fact, during this state of mind, it is said that the mind can become highly sensible to various forms of creativity.
Realize they’re coming from your brain and just enjoy the show
Rushing sounds are indeed related to OBEs, because apparently they’re signs that the astral body is disconnecting itself from the etheric body. But in order to induce successful OBEs you need to have enough energy first. No fuel, no astral travelling. In any case, I’d stick with LDs for now
If you have these hypnagogics in the middle of the night, after waking up for half an hour or so, you can perfectly use them to enter a dream consciously. This is the basic LD induction method of WILD. It’s easier to practice WILD during the early morning than when you’re going to bed in the evening, because the dreams become longer during the night. You can find a BIG Topic about WILD here (it’s already part 12, so there’s lots of information to be found there): https://community.ld4all.com/t/the-big-wild-topic-part-xii/10704
Good luck!!