Mindfulness is becoming more and more popular because it actually works for many of the problems we have in life.
Basically mindfulness is about being aware in life, aware of your thoughts particularly and not allowing yourself to get involved in the endless chatter that goes on in our heads, it is about focusing on the present moment. Being present in our lives makes every moment important because you are there living it fully, how many moments do we miss in life as we are thinking about the future or stressing about the past, before we know it months have past, years and we lived most of that time lost in the endless noise in our minds.
Everyday spend some time practising being in observer mode, that part of you that remains indifferent to thoughts, emotions etc, it just observes, takes notes and just lets them go. This part of you remains ever in the present, it observes your thoughts about the past and the future but it doesn't go with them. It observes your emotions but it doesn't get involved or identify with them.
Mindfulness can also help you in dreams, yes you can be mindful in dreams, you can wake up in your dreams and explore your own consciousness, a step further would be out-of-body experiences which truly take you to another level of understanding of yourself, who you are and the world around us.
We can use mindfulness in all aspects of our lives, be it awake or asleep, an essential tool in our journey.