(a2a) On the quest to become a fully-realised individual, every one of us, sooner or later, comes to realise that we each have a Dark Side, and the only way to become whole is to face up to it. It remains Dark, because it represents what we most hate about ourselves. Ironically however, it is also a source of strength. Hence the journey to wholeness involves integrating the Dark Side – or making your Demons work for you, instead of against you.
Luckily for you, dreaming about demons but in a non-scary manner would suggest that you are confident about facing up to your inner darkness, and are already well on the way to becoming a well-rounded individual.
Source: Alex Sumner’s answer to What does dreaming about demons but not scary mean? – Quora