Carole P. Roman's Rocket-Bye (Create Space Independent Publishing Platform, 2016) had me from the very first rhyme. In my opinion, rhyme is indispensable for pre-school kids. Add colorful pictures and a journey through space and you've got an excellent bedtime story. I really enjoyed Rocket-Bye, and I think it's a great choice for little ones.
I received a complimentary copy of Rocket-Bye to facilitate my review. No other compensation was received. For full disclosure, see the sidebar.