Lord Vishnu signifies health, prosperity and success.
Seeing Lord Vishnu in a dream is a good indication of success.
Lord Vishnu takes away all our problems and worries into himself. He is famous for removing negative energy from our surroundings.
This is one of the reasons why he is portrayed blue everywhere.
Another reason for seeing Lord Vishnu in your dream may mean that he is there to take away all of. your problems and worries and bring happiness into your life.
If you saw yourself worshipping lord Vishnu in a dream then it may only be because of your religious faith and devotion towards that particular god.