Alarm Clock Dyslexia is when one often fails to notice that the AM/PM settings are incorrect when they set their alarm. (this excludes the difference between noon and midnight, cause that is just downright confusing)
This syndrome is known to cause tardiness in the morning, however, few people know the syndrome even exists, and thus, people who do have the syndrome are often mislabeled as morons
"I am a sufferer of alarm clock dyslexia, I was supposed to wake up at 6 this morning, but it turns out I set my alarm for 6 at night. When I explained my condition to my boss, he obviously had never heard of it... he asked me if i wore a helmet to bed, then told me to go sit in the corner and think about what i just said."