Ants.

We've been overrun by these tiny things for a fair while now, if the ones in the bed are the same then they're probably Electric Ants, a recent unwanted pest import that are named for the pain inflicted from such a tiny thing. What does confuse me though is ours seem about 2 mm long, while the warning sent out only quotes them as 1.5 mm, perhaps they've grown and thrived at our place.

I notified the whatever department about them a couple of xmases ago but they must have been about to go into hibernation mode for summer as I never got a reply from them.