Question

Research has shown that more forgetting occurs when a person stays awake for learning and is then exposed to other new material

Answer 1

this research demonstrates: retroactive interference
retroactive interference refers to a situation when new learning activities became a hindrance for our memory to remember the previous material.
In order to fully memorize a certain information, it would be best if we put a time-space between each materials rather than shoving all of them at the same time.