The most widely practiced method is something called MILD (Mmemonic Induction of Lucid Dreaming) After waking from a dream you start some other activity such as reading or ironing for a short period, and then lie down to go to sleep again. Then you make a concious effort to recreate the world of the dream from which you woke, and remind yourself, "Next time I dream this I want to remember Iâ??m dreaming." Many people have success with this, but to be honest my personal method- which is also widely used- is to practice questioning your state of wakefulness. Ask regularly throughout the day "Am I dreaming?" and carry out "reality checks." A good one is to look at the clock, look away and observe whether the time is the same (in dreams things will change rapidly)or to check, for example, that you are sat at your computer in your study, rather than say, on a beach, or in your grandmothers house. The more often you do this in waking life, the more likely it is that you will do the same in your dreams and therefore increase your chance of becoming lucid. I find this method far easier to control than MILD. Incidently there is some contention about whether lucid dremaing is actually "dreaming" as such, as this article discusses: http://www.susanblackmore.co.uk/Articles/si91ld.html Whatever it is, there's no doubt that its enjoyable, and in some cases can help people to work out problems "in their sleep".