The Sleep Mode is an optional status that can be used for IoT SIMs. It is also known under the name "Tariff Holiday", especially in technical reports and API requests. The Sleep Mode allows you to block usages and suspend charges for a SIM for a limited number of days. If you SIM has a commitment period, the number of days spent in Sleep Mode do not count. Only days spent in billed statuses, such as Active or Suspended status are part of the commitment period.