Girl: EXCUSE ME!!
Guy: What! you liked it in my lucid dream!
1. The realization has been made, but there is no control of oneself or of one's surroundings
2. Semi-control of oneself, with no control over one's surroundings
3. Full control over oneself, still with no control of one's surroundings
4. Semi-control over both oneself and one's surroundings
5. Full control over both oneself and one's surroundings
There are many techniques for lucid dreaming that have been developed and improved upon over the centuries. These include: habitual reality checking, recording dreams (dream journal), meditation, verbal reinforcement, etc.
The best method (the only one from the 21st century), requires nothing but an Android device, and can be used to experience a lucid dream tonight; whereas the previous methods could take months, even years, before results are seen. To try the Android method, search for "Lucid Dreamer" by Guardanis on Google Play.
Dude 2: Really? What was it about?
Dude 1: I had a dream where I made my girlfriend appear on my bed and we did it!
Dude 2: Oh my God, no way! I wanna lucid dream tonight!
Some say it's actually a multiplayer game (especially those believing in New Age nonsense), but these rumors are denied by science.