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Discover LudwigThe expression "sleep mode" is correct and can be used in written English.
It is usually used to refer to a device or computer that is in a low-power state designed to conserve energy. For example, "I put my laptop into sleep mode so that it would save battery power overnight."
Dictionary
sleep mode
noun
The state of a computer system (especially a laptop), in which the screen and hard drive are switched off, and the only task running monitors external activity (such as a key press) which restores the system to its active state
Exact(59)
"We call it sleep mode.
"Now it's like you put your computer in sleep mode.
Laptop luggers will love the clever new Sleep mode.
If your Congress remains unresponsive, it may be in Sleep mode.
Both require batteries and slip into sleep mode after a period of inactivity to save power.
One option forces the machine to "Initiate sleep mode if system doesn't sleep automatically".
It will include a sleep mode setting that gives parents the ability to limit viewing time.
Two teenage boys have put the family synth into sleep mode and are taking her upstairs.
Once used, it could enter sleep mode and stand by for months without losing power.
Hibernation mode is meant to be used for longer stretches of inactivity than is sleep mode.
Like computers in sleep mode, scrolls were always on, ready to power-up into action.
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