There’s a moment that trips a lot of people up. You’ve got a long export running, or a build, or a backup. You need to step away from your desk for a meeting, for lunch, or for the evening, but you don’t want to leave your Mac wide open for anyone to poke at. So you lock the screen.
Then the worry creeps in: did locking it just kill my session?
The good news: no. Locking your Mac and sleeping your Mac are two completely different things, and understanding the difference is the key to walking away with confidence.
Locking is not sleeping
When you lock your screen (with Control-Command-Q, a hot corner, or a screen saver set to require a password), macOS hides your desktop behind the login window. That’s a security action. Your apps keep running, downloads keep downloading, builds keep building. The Mac is fully awake; it just won’t show anyone your work without your password.
Sleep is a power action. The CPU halts, work stops, the network drops. That’s the thing you’re actually trying to prevent while a job is running.
Awake Qubit holds a macOS power assertion for the length of your session, which tells the system “don’t go to sleep on your own while I’m working.” Locking the screen doesn’t touch that assertion. So an active session keeps running for the entire time your Mac sits locked, exactly what you want when you lock up and walk off.
Pick the right mode before you walk away
Awake Qubit offers two keep-awake modes, and the choice matters more than usual when you’re about to lock the screen and leave:
- System only: your Mac stays awake, but the display is allowed to turn off. This is the right pick for locking and leaving. The session runs, the screen goes dark behind the lock, and you’re not burning power or pixels on a lit display that nobody’s looking at.
- System + display: your Mac stays awake and the display is forced to stay on. Great when you genuinely want to see the screen (a dashboard, a presentation, a download you’re watching). But if you lock and leave with this mode, you’ll come back to an illuminated lock screen that stayed bright the whole time.
So the rule of thumb is simple: locking and walking away → System only. Staying to watch something → System + display.
The one thing that will sleep your Mac: closing the lid
Here’s the important caveat, and it’s the only one. On a MacBook, closing the lid is not the same as locking the screen. With the lid shut and no external display connected (or running on battery), macOS forces the machine to sleep no matter what any app has asked for. That’s a hardware-level behavior, and a normal power assertion can’t override it.
So:
- Lid open, screen locked → session keeps running. 👍
- Lid closed, no external display → macOS sleeps the Mac, session pauses. 👎
If you need your Mac awake with the lid down, connect an external display and keep it on power. Awake Qubit will warn you right in the app when your current setup would sleep on lid-close, so you’re never surprised.
Walk away with confidence
The whole point of a keep-awake tool is that you can leave. Lock your screen for privacy, choose System only so you’re not wasting power on a display nobody’s watching, keep the lid open if you’re on a laptop, and let the work finish while you’re somewhere else.
Your Mac stays secure. Your session stays alive. And you get to stop hovering over a progress bar.