*Grrrr I keep waking up late. Does anyone know of a way that I can get up the exact same time every morning.?

Hi, I keep waking up late and consequently coming in late for work. I need to get up at 7 AM and I have been waking up at noon. I tried buying a rooster to wake me up in the morning but it wakes me up too d*mn early. Can you guys please tell me about something I can buy that will wake me up at my desired time. I would not ask if I didn't really need your help. Please. Whoever knew that waking up on time would be so d*mn complicated.