This is known as Prospective memory.
hope this helps!
Cahokia is a known historic site that can be found in Illinois, United States. Tribes lived in this place during the 17th century and they became the most influential urban community during this time. Mound Builders was also known as Cahokia tribe, they move to other place and decline to stay due to weather condition and tribal warfare. They started moving in different regions.
Circadian Rhythm? I might be completely wrong
The bigger the tomb the wealthier you were the smaller the not so wealthy
Answer:
It is influenced by personal feelings