Sara is often tired when she wakes up, so she starts drinking coffee every day at 8:00 am, which makes her feel energized. One morning she is coming home from the grocery store she notices the time - it is 8:00 am. She had not wanted coffee before she checked the time, but she suddenly feels tired and craves the drink. Sara’s sudden craving for coffee after noticing the time is an example of which behavior? Explain that phenomena in detail.