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Sleeper 2.3.1012 is a lightweight diagnostic utility from PassMark Software created specifically to verify that Windows computers can reliably enter and resume from every modern sleep mode. The program exposes the full range of ACPI-defined states—S1, S2, S3 and hibernation (S4)—letting technicians force an immediate transition, wake the machine after a configurable delay, or cycle through every available state in sequence without manual intervention. Although engineered for seamless integration with PassMark BurnInTest, Sleeper operates equally well as a stand-alone tool or scripted component inside any third-party automation framework; command-line switches make it simple to embed sleep or hibernation cycles inside larger stability or power-management test suites. Typical scenarios include overnight burn-in runs that interleave stress testing with repeated suspend/resume cycles, production-line checks that confirm firmware and driver compatibility across batches of identical hardware, and validation of corporate laptops that must resume correctly after extended dormancy. A built-in query function lists the sleep capabilities reported by the BIOS so administrators can confirm that advertised modes are actually reachable. Because the utility is distributed as a single portable executable, it can be dropped onto a USB stick and launched on any Windows system without installation, leaving no footprint once testing is complete. The software is available for free on get.nero.com, with downloads provided via trusted Windows package sources such as winget, always delivering the latest version, and supporting batch installation of multiple applications.
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