Well it'll be the mentality of thinking you're going to wake up, knowing this happened in your last lucids.

But also what puffin said about being aware and not totally putting full concentration into stabalising helps.

Like when iwas stabalising i was looking where i was standing, i was aware of the yellowish glow of everything from the street lamps outside and i think the fact i became lucid through awareness rather than a random reality check in my dream helped with the awareness side.

Try looking around at your surroundings then doing a combination of stabalisation techniques.
Use 5 senses - try to smell things, touch yourself (not in that way....)
Be confident within yourself that you're going to stay within the dream.
Try licking stuff, wierd but it helps, i think the fact i licked my own hand in last nights dream helped since i could feel the sensation of the tiny hairs rubbing on my tounge and feel the wet saliva on my hand.
Ofcourse make sure you do a reality check beforee you stabalise - you could be really tired in the street one day and regret licking that wall.