Research has shown that certain alarm sounds can actually increase our alertness and alertness after waking up.
The Perfect Alarm Ringtone Scientifically Determined Both tempo and memorability are important
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Scientists know that in some cases, drowsiness after waking up can be dangerous after a few hours by reducing our effectiveness in making important decisions. There is even a name for this phenomenon – sleep inertia, a temporary decrease in performance that occurs upon awakening.
Also, keep in mind that the alarm clock should sound louder for younger people (or for those who sleep especially soundly).