In Windows, hibernation uses the least amount of power compared to all other power-saving modes such as sleep mode.
According to Microsoft, sleep is a power-saving state that allows a computer to quickly resume full-power operation (typically within several seconds) when users want to start working again.
To wake up a computer from hibernation, usually pressing the power button works. Other machines will only require users to move the mouse or press a keyboard key. With laptops, simply opening the lid also wakes up the machine.