Starting your dream
Go to bed the way you normally would. Get comfortable, make sure you've used the bathroom, etc. You know the drill. Whether you want to attempt becoming lucid is up to you. While falling asleep, let your unconscious flow, and create its own images. Visualize these images and create a scene for them. Create an environment out of what your unconscious throws at you. If its scary, create something scary

(you can't be hurt in dreams so don't be afraid.) While you're envisioning the scene, take in all aspects of it, and use all senses. IT IS BEST TO ALLOW YOUR UNCONSCIOUS AND CONSCIOUS TO WORK TOGETHER IN FORMING THE ENVIRONMENT!
See the scene with your eyes. Hear what is happening with your ears. Touch the things around you. Smell the combination of scents in the air. If there is anything digestible around, taste it. From here I would recommend staying conscious of what is going on around you.
(This is where you may attain lucidity, if you know what you're doing. But this guide is to help remember your dreams. Consult Mancon's Guide if you would like to delve more into the subject.)
By doing this, you are starting your dream wherever you would like it to start out. Now all you have to do is dream!
Waking up
This is probably the most essential part to remembering your dreams. If you're using an alarm clock, set it 15-20 minutes ahead of the time you normally need to wake up. This way, it is off schedule in your head. You will hear it going off in your dreams. But you wont jolt awake like you normally do. Slowly wake up and do not think about anything else but your dreams. Hit that snooze button! Lay back down, close your eyes and think.
Remembering the Dream!
For me, it has become very is easy to remember everything in full detail, but if not everything is clear to you, keep reading.
The two most memorable events you will probably remember is the one you thought about while falling asleep, and the most recent one that happened when you woke up.
From here, think about what happened right after you fell asleep. Where did you go from where you started? Were there any dream characters that entered your dream? Were there any objects that sparked your interest or were out of place? Question yourself (THIS IS ESSENTIAL!) This will allow you to create a timeline in your head.
If you do NOT remember what happened after you fell asleep, think about the very last thing you remember, and work backwards. (If you remember something from the middle of your dream, you can work either way.) How did you get to be where you were? Who was with you? Did they influence how you got where you were? Were there any forms of transportation nearby? Is it the same place you were before? What time of day was it? (The time aspect can help, because you may spark your memory and remember something that happened because it was bright out, dark out, etc.)

At this point, you should be able to remember all of your dreams!
If you are stuck
Use past dreams as a starting point!
If you still cannot remember a thing, reread some of the most recent entries in your dream journal before you go to bed. Usually, there are characters, objects, events, and places that recur over a span of dreams. Imagine these recurring dream characters, objects, events and places to create your dream as you go to bed. This may help some, but it may be useless to others. (It depends if you have repetitive or similar dreams or not.)
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