This was called the "Iron Curtain" given it's name by Winston Churchill.
Answer: Sleep apnea
Explanation:
Sleep apnea is the sleeping disorder in which a person experiences pause and start of breathing in continuous manner.Symptoms of this disorder are majorly loud and continuous snoring along with feeling tiredness even after getting complete sleep.
According to the question,Kevin might think that her mother is suffering from sleep apnea due to which she snores loudly while sleeping and feels tired in the morning after sleep.
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