Socrates Dream in Phaedo

In Plato's Phaedo, in replying to the query of Cebes that why he is composing lyrics in prison to which he never paid attention in his whole life Socrates mention about his recurring dream in which he was directed to make and cultivate music. So in obeying in its literal sense he is is writing and composing hymns. Can anybody put light that is it a rational behavior to give so much importance to dreams and to act according to content of dreams.