Dreams last night

Typically, I do not remember my dreams and even as I write this, it’s fading. But I definitely remember being blissfully happy and with a man in my life. Now for most that may be wonderful, but this jaded girl has long since given up on relationships and is very happily single.

Do dreams mean anything? If we can alter or inspire what we dream about by changing actions and thoughts before bed, are they really “messages” like some people believe or are they simply our brains clearing out the non-useful information from the day?