Oh yes. Re: Cape BReton Lullaby, Kenneth Leslie did write that. However, there is a Gaelic Translation by Catriona Parsons. She sang it for a recording of Women's songs for B&R HEritage Enterprises. This recording is not yet available due to availability of money.

There is a song in the Scottish song tradition called Caidil Gu Latha. This is an entirely different song. The Gaelic "Caidil Gu Latha" means Sleep Until Day