From Guild Wars 2 Wiki
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Narcolepsy is an effect applied to Slothasor every 20% of its health. During it, it falls asleep taking no damage, and has a defiance bar. Breaking its defiance bar removes this effect. If not ended early, this effect will last for 2 minutes.“
Slothasor is sleepy. Wake him up!
— In-game description
Note that Slothasor will also trigger Narcolepsy at 10% health remaining.