Sleeping Freshmen Never Lie is by David Lubar. The story follows Scott as he enters high school, facing many common concerns and problems, such as getting the girl he likes to notice him and dealing with both old friends and new friends. To top it all off, his mom is going to have a baby. Scott has been an only child his entire life, but one of the techniques used in the book is Scott trying to connect with his unborn sibling by writing down his observations and advice to make going to high school easier for him or her.
I really liked this book. It was funny and insightful, and everyone I've loaned it to has enjoyed it, as well. Some of the situations are obvious, as when Scott is faced with choices between friends and making the right decision, but I thought it was a nice, easy read with a lot of feel-good scenarios. It was published in 2005.
I recommend this book for all ages, but lower high school will probably appreciate it the most.