matutinal

aamu- Of, occurring in, or relating to the early morning.The American Heritage® Dictionary of the English Language, Fourth Edition (2006)
1874, w:Henry James|Henry James, "Professor Fargo" in The Galaxy 18(2) (August 1874): 233–253.

A young lady was introduced who had come to request him to raise a ghost—a resolute young lady, with several ringlets and a huge ancestral umbrella, whose matutinal appetite for the supernatural had not been quenched by the raw autumnal storm.