A pocket-sized bit of old superstition: dream it on Friday, tell it on Saturday, and it is bound to come true. Two lines, over before you know it, and a nice excuse to ask a child what they dreamed about.
From Mother Goose / Nursery Rhymes (traditional). See the whole collection.
Friday night's dream, on Saturday told,
Is sure to come true, be it never so old.
About this rhyme
Text confirms 'Friday night's dream, on Saturday told, is sure to come true' exactly.
A rhyme about dream lore rather than dreaming itself: an old belief that a Friday night's dream, told the next day, is bound to come true. Saturday was the day set aside for the telling.
Ask on a Saturday morning if there was a dream worth telling.
Public domain. Text from The Real Mother Goose (Blanche Fisher Wright, 1916), via Project Gutenberg. View the source edition