This article is from the Lucid Dreaming FAQ, by "Lars Rune Foleide" larsrune@sf.telia.no .
This technique uses a letter or symbol to induce
lucidity. Day-memories are often incorporated into the dream,
especially memory from the evening. So it is quite likely that some of
what you experience after waking up after 5-6 hours and stay up for
about an hour is incorporated into the dream. This is how this
technique work. You concentrate on a letter, A for Awareness during
that hour. Visualize yourself many times seeing that A and suddenly
remember to do a RT. Think about this for about an hour and remember
to do a Reality Test whenever you see an A. This should also be done
during the day, do a RT every time you notice an A. Writing a word or
a letter in your hand, and frequently check it might help. Just hope
that you will remember to do a RT if you see a big A in the middle of
the road. The symbol in this technique can easily be changed to your
dog, a friend, a place or an activity.
 
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