Prevent applications from muting during sleep mode?

[Helgen]

I think it is called sleep, when you leave your iphone alone and it sleeps, right?

Anyway. I was using Wunder Radio for a few days, and it wouldn't turn off during sleep mode, but I was modifying my phone a few days after, now all radio programs as well as wunder radio mute when sleep mode occurs.

What should I do to fix this? Thanks.

[moon#pie]

Get insomnia. It will keep them running