The most commonly occurring sleeplessness-produced problem is:

A) difficulty concentrating.
B) forgetfulness.
C) difficulty driving.
D) inability to work efficiently.

Sleeplessness-produced Problem

Issues or complications that arise as a direct result of insufficient sleep, such as cognitive impairments or mood disorders.

Concentrating

Concentrating involves focusing one's attention or mental effort on a specific task, object, or activity, often leading to better performance or understanding.

Forgetfulness

A common occurrence of temporary memory lapses or the inability to remember information or experiences, often due to factors like stress, aging, or lack of sleep.