I've had a similar thing happen. Got up in the morning to find several things (including my router) not working. Checked everything was plugged in and it was, just no power, yet other things in the house were working. After much head scratching I discovered a plugboard I use (which has 4 things plugged into it) also has a rocker switch for on/off and this had somehow been pressed, turning all 4 appliances off. Easily remedied once I'd found it, but how....?
Later I watched my 4 cats playing chase round the back of the settee where this plug board is and it dawned on me that they were the culprits. I've explained the issue to them and told them not to do it again...