_Source._--I have inserted into the old chap-book version of the _Four
Kings of Colchester, Canterbury_, &c., an incident entitled by Halliwell
"The Three Questions."
_Parallels._--The "riddle bride wager" is a frequent incident of
folk-tales (see my List of Incidents); the sleeping tabu of the latter
part is not so common, though it occurs, _e.g._, in the Grimms' _Twelve
Princesses_, who wear out their shoes with dancing.