Why Can We Not Attribute Feeling Bad When Waking Solely

Multiple Choice

Why can we not attribute feeling bad when waking solely to a poor night's sleep?

A) People may have slept poorly for a secondary reason, and this reason also makes them feel bad
B) People have no way of accurately measuring sleep quality
C) People need to receive less than 5 hours of actual sleep time before their sleep can be labeled as "poor"
D) People often feel good after having a poor night's sleep