The other night I had a dream about this guy and a gig I'm going to on Friday. It felt so real, and as stupid as it sounds I swear I fell in love with him. When I woke up, remembering it about half way through the day, I almost started crying in realisation that I had 'lost' him. I could feel the memory slipping away.

Can someone please tell me what the difference between a realistic dream and a lucid dream is?

Also, can I learn how to LD in the hope to recall and re-dream this dream?