I believe that technique is called a WBTB (Wake Back To Bed). This is a very effective technique in my opinion and I've had good experiences with it.

As for prolonging lucid dreams, you could try the DEILD Technique. It's where you don't move a muscle on your body as soon as you wake up and go straight into a lucid dream. This is a tricky technique and I've only been able to do it successfully when I wake up from a lucid dream.

You could also try feeling objects in your dream, be aware of your surroundings, notice every little detail, smell the air, taste food, try and use as many senses as possible while your in a lucid dream.