Rest (PSR Supplement)

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There are three levels of rest, each more restorative than the last: a 10-minute break, a shift of camping, and a day of downtime.

Break. A break takes a phase (or 10 minutes) and restores your hit points up to no more than half their maximum, rounded down. During this phase you can't perform anything but restful activity. Any benefit you receive from a "short rest" you also receive from a break.

Camp. Camping takes a shift (or 4 hours), after which you recover from 1 degree of Exhaustion, and your hit points are restored to their maximum. You also gain any benefits you would from finishing a break.
 Camping requires shelter plus a day's worth of food and water. You don't necessarily need to sleep while camping, but you can't keep watch or otherwise stay attentive during the shift to gain the benefits of camping.

Downtime. Downtime requires an entire day in a town or other civilized and peaceful area with access to shops and inns. At the end of a downtime day, you recover from all Exhaustion, your hit point maximum is restored to its full value (excluding any loss caused by Constitution reduction), and your hit points are fully replenished.
 By the end of downtime you meet all basic needs to include food, water, sleep, and hygiene at no expense. You also fully restock any common ammunition you have. You also gain any benefits you would receive from a break, from camping, and from a "long rest."
 At the end of a downtime day you can conduct trade and potentially an enterprise.

If you gain any benefit from a lesser period of rest, you always gain that same benefit from any greater period of rest.