"Ten in the Bed" is a traditional nursery rhyme or counting song for children. It starts with ten in the bed, but the number drops every time they roll over and one falls out. Normally the song finishes with "There were none in the bed!". From a counting perspective the song is very similar to Ten Green Bottles. The sheet music for this song, or the equivalent midi or mp3 files 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 Ten in the Bed for piano in PDF format.