a composed and lighthearted attitude towards reality and one’s own self is conducive to the learning of lucid dreaming.[/b]
Paul Tholey in a Letter to the Editor http://www.spiritwatch.ca/letter_to_the_editor.htm

Until you have developed at least a moderate degree of lucidity, you will almost never reconize these dream oddities for what they are, and this leads to a pitfall which can block progresss until it is understood and corrected: the mistake (common among novice lucid dreamers) is to focus on how uncritical their minds are during dreaming, using each missed dreamsign as another example proving that they never recognize dreamsigns. This is a mistake! If you do this, you use missed dreamsigns to learn that you are too unreflective, stupid, or simply lacking the capability to become lucid. This is not what you want to learn, is it? What you do want to learn is how to reconize when you are dreaming by getting to know your dreamsigns. Thus you should make sure that you reflect on which part of your dream could have told you that you were dreaming, and resolve that next time somethling like that dreamsign reoccurs, you will remember that you are dreaming.[/b]
Lucid Dreaming by Stephen Laberge

Although there are interesting posts on cheese, chocolate, vitamins, and other "supplements" to attain lucidity. More attention could be given to our outlook.

Just as our beliefs can afffect our reality checks and our dream control. Attitude may limit lucidity.

Desperation for lucid dreams, obsessing over dry spells, listing failures may be creating difficulties.

Try and cultivate the relaxed and light hearted approach with an assumption of success!