Not the ones you have when you go to sleep, but rather the things you wish to accomplish.
Personally, I think everyone should have their fair share of dreams they're willing to chase after. Set goals, aim high, and live your dreams! Why is this so important? It keeps you moving. And constantly taking steps forward is a vital part of life, right?
Your goals don't need to be big? For example, wanting to help a stranger is a pretty admirable dream way too little people have these days. Dreaming bigger is cool too, though. If you're a great artist and you want to have your work displayed in a well-known museum, then go for it! Keep improving your artistic skills and one day you'll get there, one day you'll be living the dream!
Not to mention the sense of satisfaction reaching a personal goal gives. It's best to have others ready right after though, otherwise you'll just be standing there, "what now?"
Do you have any big dreams you want to live someday?
Also, planned semi-downtime in a few minutes from now. Please bear with me!