I am a school student .I have to wake up at 4 in morning at morning for studies as I am not able to study at night. I am not able to get up at 4 .even if my mother wakes me up I am not able to till she pu some water on my eyes. Even sometimes water does not work. Once there was huge earthquake in our area but I did not get a even a slightest hint and I was sleeping .this is too dangerous for me .in fact after this year I would be going where there would be nobody to wake me up so can you suggest how I can control my my such a deep sleep and wake up on my own at desired time.