For the vast majority, dreaming is healthy and necessary to maintain good mental and even physical health. And sleep means dreaming at some point.
But the opposite isn’t always true. Dreaming doesn’t always require sleep. We do a different kind of dreaming as artists. And it’s a twofold phenomenon: we dream not only by envisioning new images, sounds, and words, but also as we work on bringing those visions to life. Making art entails a kind of dream state at times, which is so appealing it keeps us coming back to feel it again. That sense of flow during creation is like nothing else.
Along with the work, you need time to dream, and to avoid criticizing yourself when you do it. As long as it’s not taking the place of bringing a dream to reality, a healthy level of dreaming is necessary. For good art health.