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From Pathfinder Lost Omens Gods & Magic, which isn't enabled.

Tsukiyo - Moderate Boon

BOON

Tsukiyo watches over you and guards your sleep. You are guaranteed a peaceful night's rest no matter what conditions you are sleeping in. Even nightmare and similar abilities can't disrupt your sleep unless they come from a deity, artifact, or similarly powerful source.

Pathfinder Lost Omens Gods & MagicOGL