As soon as your lucid dream begins to fade visually you need to act very quickly. Just dive downwards as if diving into water. Dont worry about hitting the ground or floor and hurting yourself - just dive. The dream will fade and you won't hit the floor. Instead you will be falling in darkness. Don't worry about where you are falling to, just keep diving. Soon you will hit the ground or maybe a floor or a wall in another dream. When you hit something don't worry about hurting yourself, I have never felt any pain when I have landed even though I fall at high speed with my arms outstretched. When you do hit something the dream may begin to appear around you or you may still be in darkness. If you are in darkness use your hands to feel textures around you. Feel as many things as you can - the ground, your clothing etc. and the dreamscape will begin to form.

I have had normal DILD's that were short lived and when they ended I applied the above to recycle my lucid dreams instead of waking up. Often the subsequent lucid dreams are a lot longer and more stable.

An example of this in action:

I was in a room about to venture into another room by going through a door. The lucid dream began to fade so I immediately dived downwards. The dream completely faded away but instead of hitting the floor I continued to dive downwards into the darkness. I fell at high speed for about 7 seconds and then I hit a flat surface and my arms collapsed leaving me crumpled on the surface but feeling no pain from the impact. The dream came into view and I realised that I had hit a wall and I slid down the wall into a hallway in a brand new dream. "This is a handy neat little trick." I thought to myself