Meet the second group of finalists of Newsround's inventions competition

This week it's the finals of Newsround's inventions competition, You Too Can Be An Absolute Genius.

All week on Newsround the finalists are showcasing their inventions to a panel of clever judges and on Friday you'll find out who's won.

The first group of finalists have already demonstrated their invention, the magno-stick.

Now it's up to the second of our four groups to show how they hope to solve a problem all-too-familiar to anyone with a bunk bed...