Possible Clues:

• One of those going out a lot with a Falstaffian character from a spy ring
• Can't be easily picked up from the tracks produced by Falstaffian figure in the Land of Nod presumably
• One of those deep in the land of nod presumably won't be able to pick this up from the tracks
• It's not easy reading on tracks to Rip Van Winkle
• Person difficult to wake