D&D 5e rule · SRD 5.2
Long Rest
- Kind
- Rule
A night's rest of at least 8 hours, with at least 6 spent sleeping.
- You regain all Hit Points, all spent Hit Point Dice and your spell slots.
- Your Exhaustion level drops by 1.
- Combat, casting a spell other than a cantrip, taking damage or a long march interrupts it.
- No more than once per 24 hours.