The most common definition of a lucid dream is an intense, vivid dream whereby you become aware in your dream that you are dreaming and you have total or partial control of yourself or your surroundings, by the realisation that you are actually asleep.
During the day you can train yourself to do simple reality checks so it becomes ingrained in your subconscious mind, and therefore you will eventually do reality checks in your dream, to find out if you are dreaming or not. This is one way to become lucid in the dream. Reality checks may include looking at your hand or the floor. You can also look at a digital clock because numbers are often muddled. When you become lucid in your dream you have the power to do whatever you want such as fly, change locations or change things the list can be endless. Lucid dreams can be a useful tool to confront or get rid of nightmares too.
Nightmares are often caused by stress. Lucid dreams are perfect for combating nightmares and their underlying meaning, and in turn, nightmares are a good door opener for lucid dreaming. If you have a recurring nightmare for example, programme your mind before you go to sleep to become lucid the next time you dream your nightmare. The nightmare then becomes an anchor for obtaining lucidity. Once lucidity is reached confront or challenge the nightmare. Waking awareness is normally enough to dissolve the nightmare, which is sustained by the dream content and disappears once lucidity, is established in the same way it disappears when you wake up physically. The advantage is that you can question the nightmare when lucid and thereby resolve the problem that may be creating it.
Practice, practice, practice and have fun with it!
Love & light xxx