From the Library of Congress:
This classic work, a mix of live action and animation, was adapted from Winsor McCay’s famed 1905 comic strip "Little Nemo in Slumberland." Its fluidity, graphics and story-telling was light years beyond other films made during that time. A seminal figure in both animation and comic art, McCay profoundly influenced many generations of future animators, including Walt Disney.
And now, without any further adieu: