8 hours a day.
Without that, that amount of sleep, you are running your body in an emergency state.
Coffee is the quick fix you do to get the engine started although you know how much engine needs an oil change.
It is easy to spend another 2 hours in the night on your devices, but that steals more than 2 hours from the next day.
You can be conscious about what time you turn off and go to rest. That might in all probability make you multiple times more effective.
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