Breather

Sometimes it is impractical for a party to rest for an hour. A crowded dungeon or enemy stronghold are two examples where a party is unlikely to be uninterrupted for an hour of rest. A breather is a quick, 5 minute rest to regain hit points. But it is not as effective as the longer short rest.
A person must use an action to start a breather. To complete a breather, the person must not perform any actions, bonus actions, or reactions; and must not move faster than half its speed; for a full 5 minutes. The person may use a bonus action to end the breather at any point. If successfully completed, the person may spend 1 hit die — rolling the die and adding your Constitution modifier to it and recovering that many hit points.
Once a breather is accomplished, the person cannot gain benefit from another breather until he/she completes a short or long rest.