In Windows 11, use Sleep for short breaks because it resumes in seconds, Hibernate for longer breaks on a laptop because it saves your session to disk and uses virtually no power, and Shut Down when you are done for the day or the PC is being moved. Restart, rather than Shut Down, is the option that fully reloads Windows after updates or glitches.
| Option | Where your work is kept | Power use | Resume speed | Best for |
|---|---|---|---|---|
| Sleep | In memory (RAM) | Low, continuous | Seconds | Breaks of minutes to a few hours |
| Hibernate | On disk in hiberfil.sys
|
Virtually none | Slower than sleep, faster than a cold boot with apps reopened | Overnight or travel with a laptop |
| Shut Down (Fast Startup on) | Apps closed; Windows kernel saved to disk | Virtually none | Fast boot, fresh session | End of the day |
| Restart | Nothing kept; full reload | Not applicable | Full boot | After updates, driver installs or odd behaviour |
What is the difference between sleep and hibernate in Windows 11?
Sleep keeps your open apps and documents in memory and powers down most components, so the PC wakes in seconds but still draws a little power. Hibernate writes the contents of memory to a file on the drive and switches off almost completely, so it uses virtually no power but takes longer to resume.
The practical trade-off is speed versus battery. Sleep is ideal when you will be back soon. Hibernate protects your session if the battery runs out, because nothing is held in memory that power loss could erase.
Cause and effect: a laptop left asleep in a bag for several days can drain its battery completely, and any unsaved work held only in memory is then lost. Hibernate avoids that, which is why it suits long gaps between uses.
What is Modern Standby, and how is it different from S3 sleep?
Modern Standby (also called S0 low power idle) is the sleep model on most recent laptops. Instead of switching to a deep S3 sleep state, the PC stays technically on and powers components down in stages, so it wakes almost instantly and can stay connected to the network. Older and many desktop PCs use traditional S3 sleep instead.
Microsoft's Modern Standby vs S3 comparison notes that Modern Standby resumes at least twice as fast as S3, and that some background activity, such as Microsoft Store app tasks, can continue while the screen is off.
To see which model your PC uses:
- Right-click Start and choose Terminal (Admin).
- Type
powercfg /aand press Enter. - Look for Standby (S0 Low Power Idle) (Modern Standby) or Standby (S3) in the list of available sleep states. The output also explains why any state is unavailable.
What we commonly see: a Modern Standby laptop that feels warm or loses noticeable battery in a bag overnight. That is a sign background activity or a device driver is keeping it busy, and hibernating for longer gaps is the simple fix.
What does hiberfil.sys do, and can I delete it?
hiberfil.sys is a hidden system file in the root of the Windows drive that stores the contents of memory when the PC hibernates, and the saved Windows kernel when Fast Startup is used. Microsoft describes its size as roughly equal to the installed RAM. You should not delete it manually; disable hibernation instead if you need the space.
Microsoft's hibernation guide confirms that without the file, the PC cannot hibernate. Running powercfg /h off removes the file cleanly, but also switches off Fast Startup and hybrid sleep, which both depend on it.
Advanced nuance: powercfg /h /type reduced shrinks the file so it only supports Fast Startup (hiberboot), not full hibernation. It is a middle ground for small SSDs where you want quicker boots but never use Hibernate.
How do you enable Hibernate in Windows 11?
Enable hibernation with the command powercfg /h on in an administrator terminal, then add it to the power menu from Control Panel's power button settings. Windows 11 often hides Hibernate from the Start menu by default, even on PCs that fully support it, so both steps are usually needed.
- Right-click Start and choose Terminal (Admin).
- Type
powercfg /h onand press Enter. No message appears when it succeeds. - Open Control Panel > Hardware and Sound > Power Options.
- Select Choose what the power button does, then Change settings that are currently unavailable.
- Under Shutdown settings, tick Hibernate and select Save changes.
- Open Start > Power to confirm Hibernate now appears.
Changing system power settings needs an administrator account. If Hibernate is still missing after these steps, run powercfg /a; it lists the reason, such as a firmware or graphics driver limitation.
How do you change what the power button and lid do?
On Windows 11 version 24H2 and later, go to Settings > System > Power & battery (or Power on desktops) and open the lid and power button controls. There you can set pressing the power button, the sleep button or closing the lid to Sleep, Hibernate, Shut down or Do nothing, separately for battery and mains power.
On older versions, the same options sit under Control Panel > Hardware and Sound > Power Options > Choose what the power button does. A sensible laptop setup is:
- Close the lid: Sleep on both battery and mains.
- Power button: Hibernate on battery, so a quick press protects your work before travel.
- Sleep after inactivity: set in the screen and sleep timeout section of Settings > System > Power & battery, with a shorter time on battery.
If you are not sure which Windows 11 version you have, our guide to checking your Windows 11 version takes a few seconds.
What does Fast Startup do to Shut Down?
With Fast Startup on, Shut Down is not a full shutdown. Windows closes your apps and signs you out, then hibernates the core Windows kernel and drivers to hiberfil.sys, so the next start-up is faster. Restart performs a full reload, which is why it fixes problems that Shut Down does not.
Microsoft's Fast Startup documentation explains this hybrid process. To perform a one-off full shutdown, hold Shift while selecting Shut down. Our guide on how to shut down Windows 11 lists every method, including the command line.
Cause and effect: because Fast Startup preserves the kernel session, a driver fault can survive a normal Shut Down and reappear on the next boot. If a device misbehaves, choose Restart first. Fast Startup is also a common factor in some black screen problems after start-up.
Should laptops and desktops use different settings?
Yes. Laptops benefit most from Hibernate because battery is limited and they travel, so a mix of Sleep for short breaks and Hibernate for long ones works well. Desktops on mains power can usually rely on Sleep for breaks and Shut Down overnight, with Hibernate optional if you want your session kept without drawing power.
Restart a few times a week regardless of device. It clears memory leaks, finishes pending updates and reloads drivers, which keeps Windows responsive. Settings like these, and Windows Update itself, are fully available on any activated copy of Windows 11; if your PC shows an activation warning, a genuine Windows 11 Home key resolves it.
Frequently asked questions
Is it bad to sleep a Windows 11 PC every night?
Sleeping overnight is generally fine for desktops and laptops on mains power, and it will not harm the hardware. On battery, Modern Standby laptops slowly drain power and can occasionally wake for background tasks, so hibernate or shut down a laptop that will sit unplugged for many hours.
Does hibernate damage an SSD?
Hibernating writes roughly the contents of your RAM to the drive each time, which adds some writes. Modern SSDs are rated for very large write volumes, so occasional or daily hibernation is unlikely to shorten their useful life noticeably for typical home use. Fast Startup writes a smaller kernel image only.
Why is there no Hibernate option in my power menu?
Windows 11 often hides Hibernate even when the hardware supports it. Run powercfg /h on as administrator, then tick Hibernate under Control Panel > Power Options > Choose what the power button does. If it still cannot be enabled, powercfg /a reports the reason.
Is restarting the same as shutting down and turning on again?
Not when Fast Startup is enabled. Shutting down then saves the Windows kernel to disk and reloads it on the next start, while Restart performs a complete fresh boot. That is why support technicians usually ask you to restart, rather than shut down, when troubleshooting.
What is hybrid sleep?
Hybrid sleep combines both modes: Windows keeps your session in memory like Sleep but also writes it to hiberfil.sys. If power is lost, the PC can restore from the hibernation file. It is mainly offered on desktops using traditional S3 sleep, and needs hibernation to be enabled.
Related guides
- How to shut down Windows 11: 8 quick ways
- Windows 11 black screen: how to fix it
- Check your Windows 11 version and update to 26H2
- Windows 11 vs Windows 10: key differences
Links in this guide
| Link | Type | Why it helps |
|---|---|---|
| Check your Windows 11 version | Internal | Know which power settings menu you have |
| How to shut down Windows 11 | Internal | Every shutdown method, including a full shutdown |
| Black screen fix | Internal | Fast Startup-related start-up problems |
| Windows 11 Home key | Internal | Genuine licence to activate Windows 11 |
| Modern Standby vs S3 | External | Microsoft's explanation of the two sleep models |
| Disable and re-enable hibernation | External | Official powercfg commands and hiberfil.sys details |
| Fast Startup explained | External | How Fast Startup differs from hibernation |