Ten in the Bed by Jane Cabrera, Holiday House 2010
This is another book that my little always picks out for himself, so I would guess that makes this a perfect book for a toddler/preschooler.
You probably remember the song from your childhood -- if not the tune is simple and easy to pick up -- but Jane Cabrera changes the words a bit. For example, the first one out of bed is the snorer -- Hooray! Those slight changes in the text make for some fun illustrations.
*For reviews on books to borrow, please see Louise's Blog in Blogs I Follow