23 Jan Given the precipitous increase in the use of sleep technology devices, the key findings are timely and relevant. This information complements the data these devices provide, helping millions of consumers interpret their sleep patterns. The report comes as the first step in NSF's effort to spearhead defining. Many devices enter sleep mode automatically after the device has been idle for a specified period of time. Unlike devices in standby mode, devices in sleep mode may not be ready for immediate use. Sleep mode usually involves shutting down displays, which consume a large amount of energy. slider phone A cell phone. We can be more concrete when using actigraphy to objectively measure sleep quality. "Good" objective sleep quality is defined by sufficient duration (> 7hrs), high efficiency (> 85%), and low fragmentation (sleep architecture to the equation, whereby "Good" objective sleep quality is .