This will help you Rest more deeply. You'll recover more Condition per hour of Rest.
In-game Description
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Improved Rest is a positive affliction gained by eating or drinking certain Food And Drink and will increase condition gained while sleeping by an extra 2% (1% for Interloper) an hour while the benefit is still active. This benefit is used whenever sleeping, whether this be all at once or across multiple sleep sessions.
Causes[]
Improved Rest is received when consuming any of the following items: