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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Gordon
What colour is the icon in the top left? Orange is disconnected, Green is connected.
I'd click the disconnect button before sleeping. I guess it depends on your OS, but probably when the laptop sleeps it actually shuts the USB connection down.