without the vibration thing attach , I still sleep through this alarm ... quite frequently . it be really cute , but if you be buy it to wake a really deep sleeper then maybe we be both better off buy scream meanie ; I think that be what I be go to end up do , actually ... there be a lot of plus with this alarm clock , though . the fact that you can change the alarm tone 's pitch be pretty awesome , because I do better with higher pitched alarm . most alarm today be pretty low pitch . and the vibrate thing help to wake you up if the alarm alone do not cut it , but girl beware , you husband will pick on you about it . like the title of my review say , depend on how deep you sleep and personal preference .