Resting

Heroic though they might be, adventurers can't spend every hour of the day in the thick of exploration, social interaction, and combat. They need rest-time to sleep and eat, tend their wounds, refresh their minds and spirits for spellcasting, and brace themselves for further adventure.

Adventurers can take a short rest one or more times in the midst of an adventuring day and a

long rest to end the day.

Recuperating

You can use downtime between adventures to recover from a debilitating injury, disease, or poison.

After three days of downtime spent recuperating, you can make a

DC 15 Constitution saving throw. On a successful save, you can choose one of the following results:

End one effect on you that prevents you from regaining hit points.
For the next 24 hours, gain advantage on saving throws against one disease or poison currently affecting you.