Sleep and wake guide
You leave your Mac with windows spread across two or three monitors, come back, wake it, and everything has jumped to the main display or the laptop screen. It happens on MacBooks with an external monitor and on desktop Macs like the Mac mini with more than one monitor, on Apple Silicon and Intel alike. The windows are not lost, but putting them back by hand every morning gets old quickly.
Short version: while the Mac sleeps, a monitor can briefly look disconnected, so macOS moves its windows somewhere safe and usually leaves them there on wake. Try the free fixes below first. If they do not stick, SnapState can save your layout and restore it automatically on wake.
Many monitors go into a deep power saving state while the Mac sleeps, and some drop their connection completely. From the Mac side, that often looks the same as unplugging the cable. macOS generally responds by moving the windows from the missing display onto a display that is still there, so nothing ends up off screen.
On wake, the monitor powers back up and macOS re-detects it, but it does not reliably send each window back to its earlier display and position. Displays can also wake at slightly different speeds, so windows may already have been moved by the time the slower monitor appears. The result is the familiar pile of windows on the main display. It is the same underlying behavior as windows moving after you unplug a monitor, just triggered by sleep instead of a cable.
These are worth trying before you pay for anything. Results vary by Mac, monitor, and cable.
SnapState is a native macOS menu bar app. A workspace captures the visible windows on the current desktop with their position and size, the apps needed to relaunch them, the monitor and display layout, and the active tab URL of each window in Safari, Chrome, Edge, Brave, Arc, and Chromium once Automation permission is granted. If a monitor is missing on wake, saved window frames are remapped onto the displays you have now, and the monitor connect trigger can put things right once it returns.
The same approach helps if your windows rearrange when you close the MacBook lid in clamshell mode or switch your monitor input.
SnapState costs $9.99 as a one-time purchase, with a lifetime license for up to three Macs and a 14-day refund. Version 2.5.2 requires macOS 15.7 or later on Apple Silicon and Intel Macs and ships as a signed, notarized DMG rather than through the Mac App Store. It needs Accessibility permission to move windows, and workspace data stays local on your Mac as JSON in ~/Library/Application Support/SnapState/.
SnapState saves and restores only the visible windows on the current desktop, so it does not save or restore macOS Spaces. If your windows are spread across several Spaces, only the current desktop is covered. Firefox is not supported, and only the active tab URL per supported browser window is restored, not full tab sets. It is not a tiling or snapping window manager, and it requires macOS 15.7 or later.
Many external monitors power down deeply while the Mac sleeps, and some drop their connection entirely. macOS generally treats that as a disconnected display and moves its windows onto a display that is still available, often the built-in laptop screen or the main display. When the monitor comes back, macOS re-detects it but does not reliably send each window back to its earlier display and position.
It can. The same pattern is often reported on desktop Macs such as the Mac mini with two or more monitors, where windows gather on one display after wake because another display was slower to reappear or briefly looked disconnected.
You can check the display arrangement and main display in System Settings > Displays, look in your monitor on-screen menu for options related to deep sleep or automatic input detection (names vary by model), or try Stay by Cordless Dog, which has been free since version 1.5.1 and restores window positions per display setup automatically.
Save a workspace while every window is where you want it, then arm it to restore on wake from sleep, when a monitor connects, or when a matching display layout appears. SnapState moves the saved windows back, relaunches missing apps, and remaps saved frames onto the current displays if the setup differs.
It restores the visible windows on the current desktop only, so it does not save or restore macOS Spaces. Firefox is not supported, only the active tab URL per supported browser window is restored, it is not a tiling window manager, and it requires macOS 15.7 or later.