Lost audio after wake

Hello 😐

Device is Macbook Pro (Retina, 13-inch, Mid-2014), running Yosemite 10.10.2.

I've lost audio after wake. Closed lid and put to sleep last night with VLC (2.1.5) left open and video paused. Was not on HDMI.

No sound comes from the speakers. Output device set as Internal Speakers.

Any idea how to fix?