What do buddha taught about dreams? What has buddha told about dreams? Do dreams have any link with truths or realities? If a person understands something from his dream which he is asking in this world, than should such things considered as real? How is this world also one of the dream worlds among other infinite dream worlds/parallel universe? Is dream a type of meditation state?
Monks are not supposed to interpret dreams


  Whereas some recluses and brahmins, living off food given in faith, maintain
  themselves by wrong livelihood through the low arts such as: 
  
  ...
  
  
  interpreting dreams
  


Te,vijja Sutta

Mahāsupina Jātaka does mention the Buddha interpreting 16 dreams King Pasenadi Kosala. 

But with regarding dreams, there might be no accurate way to interpret them, by anyone other than the Buddha.

Dreams are not meditative states. In meditation you should be focusing on a particular object or having awareness. In both cases it is unlikely you might have a dream unless you dose off.