sleepläge

Sleepläge is a low-power state used by electronic devices to reduce energy consumption during periods of inactivity while preserving the current user session. The term is used in Swedish to describe modes on computers, smartphones and other devices that can resume quickly after a brief absence. In most implementations, sleepläge involves reducing power to most components while keeping memory or storage in a state that allows rapid restoration of the operating session.

Two broad approaches are common. In suspend-to-RAM (sleep), the active session remains in RAM, which is kept powered at a minimal level, allowing fast wake and keeping open documents and programs. In suspend-to-disk (hibernate), the session is written to non-volatile storage and the device enters a near-complete power-off state, taking longer to resume but consuming far less energy. Some systems support hybrid sleep, which combines both methods.

Wake and control: sleepläge is usually entered automatically after a period of inactivity or manually by the user. It can be exited by input from a keyboard or mouse, pressing the power button, or a scheduled timer. Modern devices and operating systems also require authentication on wake to improve security.

Advantages and caveats: sleepläge reduces energy use and allows rapid resume, but it can still consume power, especially RAM-powered sleep. If the device loses power before waking, unsaved work may be lost in some configurations. Hardware drivers and firmware must support sleep modes, or wake behavior can be unstable. Security considerations include potential exposure if the device is left unattended and unprotected.

Standards: power-management specifications such as ACPI describe standard sleep states and transitions used by many operating systems.