Read and find out about sleep in this colorfully illustrated nonfiction picture book.

Why do you get sleepy? When you feel tired, your body is telling you that it needs a rest. Everyone needs sleep. Babies need lots of sleep. Grown-ups need less. But no one can go without sleep for long.

A team of scientists stayed awake for as long as they could to see what could happen. Read and find out some wide-eyed facts about the science of shut-eye.

This is a clear and appealing science book for early elementary age kids, both at home and in the classroom. It's a Level 1 Let's-Read-and-Find-Out, which means the book explores introductory concepts perfect for children in the primary grades. The 100+ titles in this leading nonfiction series are:

• hands-on and visual
• acclaimed and trusted
• great for classrooms

Top 10 reasons to love LRFOs:

• Entertain and educate at the same time
• Have appealing, child-centered topics
• Developmentally appropriate for emerging readers
• Focused; answering questions instead of using survey approach
• Employ engaging picture book quality illustrations
• Use simple charts and graphics to improve visual literacy skills
• Feature hands-on activities to engage young scientists
• Meet national science education standards
• Written/illustrated by award-winning authors/illustrators & vetted by an expert in the field
• Over 130 titles in print, meeting a wide range of kids' scientific interests

Books in this series support the Common Core Learning Standards, Next Generation Science Standards, and the Science, Technology, Engineering, and Math (STEM) standards. Let's-Read-and-Find-Out is the winner of the American Association for the Advancement of Science/Subaru Science Books & Films Prize for Outstanding Science Series.