Theres a technique i heard about called dream spinningwhere if you realise you are dreaming you can actually consiously decide to start spinning like you may have done as a child? yes, so spinning actually increases your perception of your dream surroundings because you are focusing on what is happening at that time and what your senses think they are picking up. if that doesnt work, try falling backwards or willing yourself to do something stupid that is impossible to do in waking life - like jumping really high.