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Among annoyances caused by alarm clocks is [[sleep inertia]], a feeling of grogginess that results from abrupt awakening. ''Progressive alarm clocks'' claim to solve this issue. They include sunrise alarm clocks, dawn simulators and progressive auditory alarm clocks.
Scientific studies on sleep having shown that [[Sleep#Stages of sleep|sleep stage]] at awakening is an important factor in amplifying sleep inertia, alarm clocks involving ''sleep stage monitoring'' have also appeared on the market in [[2005]]. Using sensing technologies such as [[Electroencephalography|EEG]] electrodes ([http://web.archive.org/web/http://www.axonlabs.com/pr_sleepsmart.html SleepSmart] from Axon Labs) or [[accelerometers]] ([http://www.sleeptracker.com SleepTracker] from Innovative Sleep Solutions and [http://web.archive.org/web/http://www.axbo.com/infactory/1_home_en/news_list.jsp.html aXbo]), these alarm clocks are supposed to
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