The methods used to induce lucidity in dreams are based on our sleep cycles, specifically on our REM periods. REM sleep is where we usually or normally spend our time dreaming, though one can also dream in NREM sleep as well. REM sleep occurs normally around 90 minutes after one goes to sleep. The cycles or periods of REM sleep are short in length and far apart between each other at the start of the night. However, as we continue sleeping, the periods grow larger in time and each one is closer to the other as well, with the largest periods taking place in the mornings. So, you see, it's not that the method requires for you to sleep 8 hours a day for it to work. It's just usually recommended to practice in the mornings as our REM periods are far closer to each other and last longer, thus boosting our chances for inducing a lucid dream. If you're finding it hard to WILD in the mornings though, then you can organize your practice around the REM periods situated in the middle of the night, before the actual morning takes place.
Hope this helps.
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