In described examples, an energy efficient task scheduler for use with a processor provides multiple reduced energy use modes. In one embodiment, a system (100) for executing tasks includes a processor (102) and a task scheduler (106). The processor (102) provides multiple different reduced energy use modes. The task scheduler (106) is executable by the processor (102) to schedule execution of multiple sleep tasks (116). Each of the sleep tasks (116) corresponds to a different one of the reduced energy use modes. The task scheduler (106) is executable by the processor (102) to execute each of the sleep tasks (116), and as part of the execution of the sleep task (116) to: place the processor (102) in the reduced energy use mode corresponding to the sleep task (116), and exit the corresponding reduced energy use mode at suspension of the sleep task (116).
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