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Comment by FPGAhacker | Hacker News Reader

A closed lid MacBook will sleep unless an external monitor is connected. Amphetamine/KeepingYouAwake/Caffeinate does not change that.

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    Closed-lid + External Monitor + Power Supply = awake
    Closed-lid + External Monitor + Battery = sleep
    Closed-lid + External Monitor + Battery + Amphetamine = awake

Mine sleeps with the lid closed unless it’s plugged into power.

In what context are you using an external monitor without plugging your laptop into power?

You could forget to bring your power adapter home and have some short tasks to do at home which benefit from large screens.

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