A French man allegedly sexually abused a sleeping woman he sat next to in the first-class cabin of a Miami-bound flight — and returned to leave her a creepy note, according to court records.

Guillaume Sebastien Roger Mattler, 48, faces a count of abusive sexual contact for the disturbing incident that unfolded Tuesday on Swiss International Air Lines Flight LX64, according to a federal criminal complaint obtained by The Post.

Guillaume Sebastien Roger Mattler, 48, allegedly sexually abused a woman he sat next to in the first-class cabin of a Miami-bound flight.…