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Most of the alarm clock on the sound make a person sober.
But this kind of alarm clock.
The sound annoyed, but was forced to wake up still sleepy.
Affect roommate that they don't need to get up.
The alarm clock is very easy to be turned off, and continue to sleep.
Too hot can fundamentally vanquishes drowsiness
This will allow yourself to get up
This also contributes to the hypotension who gets up
There is no longer any annoying noise, it will not affect the others