For beginning lucid dreamers, the most relevant Tibetan technique is called "comprehending it by the power of resolution," which consists of "resolving to maintain unbroken continuity of consciousness" throughout both the waking and dream states. It involves both a day and night practice.
!. Day Practice
During the day, "under all conditions" think continuously that "all things are the substance of dreams"(that is, that your experience is a construction of your mind) and resolve that you will realize their true nature.
2. Night Practice
At night, when about to go to sleep, "firmly resolve" that you will comprehend the dream state-that is, realize that it is not real, but a dream. (Optional exercise:Pray to your guru that you will be able to comprehend the dream state. This option will probably need to be modified for most people.
If you have a guru, go ahead and pray. If you don't have a guru, but do pray, then pray as usual. You can also substitute a symbolic figure associated in your mind with lucid dreaming. If you neither pray nor have a guru, either skip the instruction or ask help from the wisest part of yourself.)
Commentary
Because we dream of things that have concerned us recently, it is likely that if you spend enough time thinking during the day that "everything is of the substance of dreams," then eventually you will entertain that thought while you are dreaming.
(adapted from Evans-Weniz.)
Reference: Exploring the World of Lucid Dreaming:Stephen LaBerge, Ph.D. & Howard Rheingold