Are you sure its not Rivers moving about? Parrots and birds aren't stationary at night. They move about, readjusting position. Some play a bit for short intervals. Do you see droppings, paper etc with chewed areas? Check out other areas to. Mice don't stay in one area. They usually travel around room edges. Look for droppings. They chew on furniture. Look at bottom of sofas etc. Travel along pipes isn't uncommon. Check under sinks in kitchen and bathroom. These are the first important steps. Positive notify management if in rental. The entry point could be in any apartment. In a house do the same. A home is easier and harder. Do the same as apartment in looking for entry and travel. Do you have children, other pets? Then decide what you're willing and able to do safely. There are a variety of ways to kill and/or capture mice.