I guess if there was suction then it might be kind of hard to fly, but maybe you could try that next time if it were to happen again?
Or have you heard of dream spinning (method to change your dream scenery)? Maybe you could take that concept and alter it a little if you have control over your body. Try something like spinning/flipping while thinking that you will be in water instead of the air. And then when you stop spinning, if you find that you actually are in water, you could come up out of the water to see where you are, or try to decide where you want to be when you come up from the water, or even just explore the underwater world. =D
Possibilities are endless. Dreamland is amazing.