the essense of the verse is all about the image or imagination and expression.
睡梦与黎明 // what are 睡梦与黎明? we don't know, but they are the things let your imagination to fly, to fly as far you could and to fly as high as you can. the realm of mind is no limitation and no boundary, just like the air, like the water, or like wind or like the cloud, free spirit, free entity, free domain, free self, unique self, ...
被一粒北风中的尘叫醒 // 被叫醒, 一粒尘, 北风中的尘. how come? what does it mean. we don't know, but they are something make you feel good when to read this.
而我 却是闻到了海风 // now it is me. simple, i smell the 海风
那特有的咸味 // it is salty, 特有的咸味. what does this mean? am i happy, or am i not happy. if neither, then what it is? it is complexity of feeling and state of mind.