OK, taken from the tutorial, these are the basic, known ways to stabilize a dream, which makes them last longer.

How to Stabilize a Dream


Stay calm
Hand-rubbing: try rubbing your hands together and experiencing the texture, friction, warmth, etc.
Spinning. There are many variations. Try and see what works best for you. (can be used to switch dream scenes). As you spin, imagine and feel that you are bumping into objects.
Focus on the Senses: what do you see? What do you hear, taste, smell, and feel? Can you see what's around you? Is there a breeze? How cold or warm is it? Etc. Focus on these details.
*Focus on textures, by looking at them and feeling them. This can be a texture in the environment, or on you. Look at the hair on your arm, or the fingerprints on your fingers.
Look down at your own body
Look down at the ground
Shout, "Clarity Now!"/"Increase Clarity"/analogous phrase
Speak out loud
Do [more] reality checks
Concentrate on the feeling of your dream body as you move. The breeze against you, the stretching of your muscles, the brush of your clothing against your skin, etc.
Do not think of your physical body. Don't TRY not to think about it. Just don't. If you do find yourself thinking about your body lying in bed, immediately distract yourself with the dream environment.
Begin to meditate within the dream
Lay down and attempt WILD within the dream (can be used to switch dream scenes)
Does anyone have any unique ideas as to how to stabilize a dream/make it last longer? Have you done anything unique before? I had this idea...though I just have to remember to do it in a LD. It was to go to lucid court and sign a document stating my lucids would last longer...I thought of this two months ago. It's not that I haven't had many lucids since then, just that I never remember!