Simple button deep sleep on/off functionality

[Deouss]

Let's say we want to put ESP32 to sleep and after some time wake it up with simple button press.
Button press - sleep - one more press - wake up
What do you think would be the easiest and elegant way to do it?

Thanks

[ESP_Sprite]

Write your program to watch the button GPIO. If it detects it's pressed, go into deep sleep and configure that GPIO as a wakeup source.