Apple iTunes has a free iTunes App Sale: Nighty Night Circus (normally $2.99).

About

"Nighty Night Circus" has a magical setting and a very special bedtime-atmosphere full of animations and color. More than 3 million parents bring their children to bed with “Nighty Night."

Features:

• Stunning designs and animations by Oscar nominated artist Heidi Wittlinger
• Up to 11 interactive animals (Lion, Elephant, Seal, Fleas, Rabbit, Snake, Owl, Monkey, Pig, Fish and Bear)
• Autoplay-mode
• 16 languages with narration: English (UK and US), German, Swiss German, Spanish, French, Dutch, Swedish, Italian, Norwegian, Brazilian Portuguese, Russian, Turkish, Chinese, Japanese and Korean.

Requirements

• Requires iOS 7.0 or later
• Compatible with iPhone, iPad, and iPod touch
• This app is optimized for iPhone 5, iPhone 6, and iPhone 6 Plus