Sometimes people become lucid in a dream seemingly without any particular reason, just suddenly realizing that they are dreaming. But mostly, lucidity is triggered by an incongruity which would not occur in physical life, such as flying, or being unable to turn off a light switch, or words rearranging themselves, or anything that ‘cannot’ happen in the physical world.
If you’d like to have more lucid dreams occur by themselves, you need to start taking note of anything strange in your daily life and ask yourself if you’re dreaming. Does that person really have five eyes? What do you mean you’re leaving me, we’re not even a couple?! Look, I know the price of food is going up, but $50 for an ice cream just doesn’t make sense does it?
Things like this happen in dreams, and we just ‘take them for granted’. Why? At core it is nothing less than that we take life for granted. Are we stopping to appreciate each moment for what it actually IS, rather than passing it off as a repeat of something that’s happened before? Being in the moment and observing accurately is a skill we can train to assist in having more lucid dreams, besides the fact that if we did it all the time, life would never be boring again!