"Wee Willie Winkie" is a nursery rhyme of Scottish origin, though known widely and associated with bed-time. The original lyrics were written by the Scottish poet William Miller (1810- 1872) though they are widely adapted. The Rhyme can be sung in English using "town" and "night-gown" or in traditional Scots using "toon" and "night-goon" (or even "nicht-goon"). It is also normal practice to replace "eight o'clock" with the child's normal bedtime in the last line of the first verse, as a way to encourage your child to go to bed and go to sleep. In Scotland the melody was adapted with different lyrics for a series of adverts in the 1960s for the drink "Irn-Bru". PDF sheet music, Midi and Mp3 files for this melody can be downloaded using the links in the left-hand menu.
The image below is the first page of the sheet music, and here you can download the full sheet music for Wee Willie Winkie for piano in PDF format.