Long Rest
A Long Rest is a period of extended downtime—at least 8 hours—available to any creature. During a Long Rest, you sleep for at least 6 hours and perform no more than 2 hours of light activity, such as reading, talking, eating, or standing watch.
During sleep, you have the Unconscious condition. After you finish a Long Rest, you must wait at least 16 hours before starting another one.
Benefits of the Rest. To start a Long Rest, you must have at least 1 Hit Point. When you finish the rest, you gain the following benefits:
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Regain All HP. You regain all lost Hit Points and all spent Hit Point Dice. If your Hit Point maximum was reduced, it returns to normal.
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Ability Scores Restored. If any of your ability scores were reduced, they return to normal.
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Exhaustion Reduced. If you have the Exhaustion condition, its level decreases by 1.
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Special Feature. Some features are recharged by a Long Rest. If you have such a feature, it recharges in the way specified in its description.
Interrupting the Rest. A Long Rest is stopped by the following interruptions:
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Rolling Initiative
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Casting a spell other than a cantrip
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Taking any damage
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1 hour of walking or other physical exertion
If you rested at least 1 hour before the interruption, you gain the benefits of a Short Rest. See also “Short Rest.”
You can resume a Long Rest immediately after an interruption. If you do so, the rest requires 1 additional hour per interruption to finish.
Source · SRD 5.2.1 · page 185