It does that on purpose to keep you awake. I suggest learning both keyboard layouts so you are prepared to switch


Seriously though, it looks like it just switched from QWERTY to AZERTY (as for the numbers that's a bit strange though that might be normal on an AZERTY keyboard, never used one). From a bit of googling it seems Ctrl+Shift or Alt+Shift might cause the switch. It didn't when I tried it just now but it might have to do with different settings, keyboard settings, etc...