What happens when you put your pc in sleep mode


What precisely happens when you choose “Sleep” in the Windows PC’s power options? We’ll look at what it means and whether your computer has dreamy nights.

Sleep Is a Low-Power Mode

Putting your computer in sleep mode is distinct from shutting it off, which turns it off entirely. Your computer takes longer to restart after being shut down, and you must first close any open programs and files.

When you want to continue working, a computer can swiftly restart full-power operation (often within a few seconds) by going into sleep mode, which is a power-saving state. Your computer performs the following when you switch to Windows’ sleep mode:

  • The screen goes dark.
  • The computer records its present state in memory.
  • The majority of the hardware devices no longer receive power from the PC.
  • The computer enters a low-power mode.

You won’t lose any work or the state of your computer as long as your PC is still receiving some power (for instance, if your desktop computer is still plugged into the wall or your laptop’s battery is still charged). You can continue where you left off as soon as your computer restarts.

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The Magic of ACPI Power Modes

It’s simple to use sleep mode in Windows; all you have to do is click a button or choose an option from the menu. Have you ever thought about how they operate at a lower level, though?

ACPI Sleep States control sleep mode. Operating systems employ the power management specification known as ACPI (Advanced Configuration and Power Interface) to regulate the power states of hardware. The standard lists six major ACPI power states, which are sometimes referred to by their acronyms. As follows:

  • S0: Working
  • S1: Sleep
  • S2: Sleep
  • S3: Sleep
  • S4: Hibernate
  • S5: Soft Off

Your computer is in the S0 power state when it is turned on and functioning regularly. The power states S1, S2, and S3 are decreasing in number. S1 and S2 are not frequently utilized. The CPU of your PC halts processing instructions in S1, but it doesn’t lose power. Your computer’s CPU loses power in S2. Most of the parts of your PC lose power during S3 (also known as Standby or Suspend to RAM), with the exception of the memory, which is kept refreshed using very little power. When you put your computer to sleep, S3 is the most frequently used mode (as determined by the hardware manufacturer of your PC).

The hibernation state is S4. In this state, your PC turns off after saving the contents of its memory to a hard drive’s hibernation file. Your computer reads the hibernation file and recovers your open programs and files from the hard drive when you wake it up from hibernation. The “soft off” state is S5. Your computer is entirely unplugged at this point. It’s the same as if you had shut down your computer by pressing the power button.

How to Put Your PC to Sleep

How do you actually put your computer to sleep now that you know what happens? Fortunately, both Windows 10 and Windows 11 make it quite simple. On many devices, you only need to push the power button once to put your computer into sleep mode by default. If it doesn’t work, enter the Start menu and choose “Sleep” from the power icon. Alternatively, you can use your keyboard’s “U” and “S” keys after pressing Windows+X. Your computer will shut down immediately.

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