Sleep vs shutdown vs hibernate: which is best?
Modern computers offer three main power modes. Understanding the difference helps you choose the right option for your usage.
Sleep mode (Standby)
Sleep mode keeps your session in RAM while using minimal power (1-5 watts). Your PC wakes instantly when you press a key or move the mouse. Best for short breaks during the day.
Hibernate
Hibernate saves your session to the hard drive and powers off completely. It uses zero power but takes longer to resume than sleep. Best for laptops when you won't use them for hours but want to keep your work open.
Shutdown
Full shutdown closes all programs and powers off completely. With modern SSDs, boot time is typically 10-30 seconds. Best when you won't use the computer for an extended period.
When to shut down your computer
Consider shutting down your PC if:
- Overnight or weekends - Saves energy and allows Windows updates to apply on restart
- Thunderstorms - Unplug during electrical storms to protect from surges
- Going on holiday - No reason to leave it running when away for days
- Performance issues - A restart clears memory and can fix sluggish behaviour
- Gaming PCs - High-performance systems draw more power; shutdown saves money
When to use sleep mode
Sleep mode works well when:
- During the work day - Quick resume lets you continue tasks instantly
- Laptops on battery - Uses minimal power while staying ready
- Waiting for downloads - Keep the computer awake to finish large file transfers
Energy costs comparison
A typical desktop PC uses:
- Active use: 100-300W (gaming PCs higher)
- Idle: 50-80W
- Sleep: 1-5W
- Off: 0W
With Australian electricity averaging 30-35 cents per kWh in 2025-2026, leaving a PC idle overnight (12 hours at 60W) costs roughly 25 cents per night or about $7.50 per month. Sleep mode reduces this to under 50 cents per month.
Should I shut down my gaming PC?
Gaming PCs with powerful graphics cards can draw 300-500W under load and 80-150W idle. Shutting down when not gaming saves significant power. Modern NVMe SSDs boot Windows in under 20 seconds, so shutdown is less inconvenient than with older hard drives.
The verdict
For most users: use sleep mode during the day and shut down at night. This balances convenience with energy savings and ensures your PC receives important security updates that require a restart.
Next article: Repair or buy a new laptop?