Here’s what you oughta know about sleep mode on your Mac.

Instructions in this article apply to Macs made in 2005 and later.

The three modes are Sleep, Hibernation, and Safe Sleep, and they each work slightly differently.

Location of the Terminal app on a Mac

Apple says that models from 2005 and later directly support Safe Sleep mode.

Some, but not all, earlier versions of Mac hardware include the feature.

Here’s what to do.

Terminal on a Mac displaying the sleep mode number

It’s in theUtilitiesfolder underApplications.

It also moves inactive memory to disk before hibernation occurs to create a smaller memory footprint.

When your Mac wakes from sleep, it doesn’t restore the inactive memory right away.

Sleep Mode version in Terminal

Apps may take longer to load after your Mac wakes up.

A laptop can remain in this state for up to 30 days under ideal conditions.

Most users with batteries in reasonable shape and fully charged could see 15 to 20 days of standby power.

Mac computers from 2013 and later support standby operations.

You need youradministrator passwordto complete the change.