hibernation mode
noun phraseUK /ˌhaɪ.bəˈneɪ.ʃən məʊd/
US /ˌhaɪ.bɚˈneɪ.ʃən moʊd/
A special sleepy state that a computer or gadget goes into to save power when you are not using it.
My tablet went into hibernation mode after I left it alone for an hour.
OTHER MEANINGS
2. A long, deep sleep that some animals take during winter.
The bear stayed in hibernation mode all winter long.
3. A quiet, inactive period when someone takes a break from activity.
After the busy holidays, our family went into hibernation mode at home.
4. A setting that pauses background tasks to save energy.
The laptop switched to hibernation mode to keep its battery from draining.