要怎么证明那不是一场梦
[yào zĕn me zhèng míng nèi bù shì yī chăng mèng]
Literally it asks 'How do I prove that was not a dream?'. When people wake up or come out from a fantasy, they always need to tell apart if everything they've felt so vivid and real was truly there or just a product of their imagination - the nickname reflects doubts of illusions against reality