Find That Book

Looking to find a sci-fi book series i read as a kid. The premise as i can remember it, is a boy that leads a troubled life and when he dreams, he is pulled into these dystopian/nightmares of some sort.

The plot revolves around him collecting relics in these dreams, but i forget why.

The covers of the first three books (as i remember) is a Clocktower, the second has an old red steam engine at a crossroads, and the third is a bed floating in the middle of the ocean!!

There are more books in the series, i just never got to read them!

Thanks!