SomaFM's "Mission Control playlist: http://somafm.com/play/missioncontrol
According to Soma FM:
Mission Control: Celebrating NASA and Space Explorers everywhere
Live Space Shuttle STS-131 Shuttle Mission Coverage. (Astronaut sleep periods are from aproximately 9am-5pm pacific time so there isn't much activity during that period.)
Soma is playing space-themed music, interspersed with reports on the mission.