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Why some mornings are so diffcult without HappyWakeUp ArousalClock?

April 26, 2017arousalclock diffcult happywakeup mornings

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Why some mornings are so diffcult without HappyWakeUp ArousalClock?

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If your standard alarm clock gives the signal during deep calm sleep (sleep stages S2 – S4) or during REM sleep it is really difficult to wake up. This is called “sleep inertia” or even “sleep drunkenness” and you feel “groggy” or “confused”.