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How to keep a MacBook awake for a timed agent run with Insomnia

Install Insomnia, then start a timed awake session so a long agent job keeps running with the lid closed.

Credentials. The installed sudoers rule lets any program running as your user account run the pmset power commands without a password, so review /etc/sudoers.d/insomnia before you install.

Who it is forA developer who starts a long coding agent task on a MacBook and needs it to keep running after they close the lid and walk away.

The problemmacOS sleeps the laptop when the lid closes, which stops a long task and can leave work unfinished.

The outcomeThe Mac stays awake until the session end time, the lid-close actions are applied, and the session's changes are undone when it ends.

What you need first

  • A Mac with Apple Silicon running macOS 26 or later
  • Your administrator password, because the installer adds a sudoers rule
  • Terminal access, and optionally Xcode with Swift 6.2 or later if you build from source
  • A stable, well-ventilated surface for the Mac during a session, as the README advises

Steps

  1. Paste the install prompt from the README into your coding agent, or follow docs/install.md, and enter your password in Terminal when asked.
  2. Run open "$HOME/Applications/Insomnia.app" to start the app.
  3. Click the eye in the menu bar, enter days, hours and minutes, and press Enter to start the session.
  4. Check Settings, including the lid-close options, before you close the lid.
  5. Read ~/Library/Logs/Insomnia/insomnia.log after the first session to confirm what happened.

Prompt for your agent

Using the repo https://github.com/krishhgg/Insomnia, install Insomnia on this Mac by following skills/install-insomnia/SKILL.md, and if a step needs my password, give me the exact Terminal command to run. Then start a session of <session-length> from the menu bar eye. Verify that ~/Applications/Insomnia.app exists and report the installed version from Settings > App.

Caveat. Insomnia is described as experimental, the timer is not a safety guarantee, and the battery and heat rules only work while the app is running.

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