Research on the physiological roots of procrastination have been concerned with the role of the prefrontal cortex, the area of the brain that is responsible for executive brain functions such as impulse control, attention and planning. This is consistent with the notion that procrastination is strongly related to such functions, or a lack thereof. The prefrontal cortex also acts as a filter, decreasing distracting stimuli from other brain regions. Damage or low activation in this area can reduce one’s ability to avert diversions, which results in poorer organization, a loss of attention, and increased procrastination. This is similar to the prefrontal lobe’s role in ADHD, where it is commonly under-activated.

https://en.m.wikipedia.org/wiki/Procrastination