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.
- the melody should be such that it is easy for her to sing along;
- it has a dominant frequency of about 500 Hz;
- it’s not too fast or too slow (ideally 100-120 bpm).
Also, keep in mind that the alarm clock should sound louder for younger people (or for those who sleep especially soundly).