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 batteries and spirits for force- and tech-casting, and brace themselves for further adventure.
Adventurers can take short rests in the midst of an adventuring day and a long rest to end the day.
Short Rest
A short rest is a period of downtime, at least 1 hour long, during which a character does nothing more strenuous than eating, drinking, reading, and tending to wounds.
A character can spend one or more Hit Dice at the end of a short rest, up to the character's maximum number of Hit Dice, which is equal to the character's level. Whenever a character spends a Hit Die to regain hit points, the player rolls the die and adds the character's Constitution modifier to it. The character regains hit points equal to the total. The player can decide to spend an additional Hit Die after each roll.
Long Rest
A long rest is a period of extended downtime, at least 8 hours long, during which a character sleeps for at least 6 hours and performs light activity, such as reading, talking, eating, or standing watch, for no more than 2 hours. If the rest is interrupted by a period of strenuous activity—fighting, casting powers, at least 1 hour of walking, or similar adventuring activity—the characters must restart the rest to benefit from it.
At the end of a long rest, a character regains all lost hit points. The character also regains spent Hit Dice, up to a number of dice equal to half of the character's total number of them (minimum of one).
A character can't benefit from more than one long rest in a 24-hour period, and a character must have at least 1 hit point at the start of the rest to gain its benefits.
Variant: Resting in Armor
Resting in armor makes it difficult to recover fully. At the end of a long rest, if you wore your armor, you only recover one-quarter your spent Hit Dice (minimum of one), instead of half.