Given passage
Researchers say that normal people may have four or five REM periods of dreaming a night. The first one may begin only a half hour after falling asleep.
Test question
How long does it take for the first REM period to begin?
I'd like to know whether there is an answer to the test question according to the given passage. I think the question is incorrect.
If I had to answer that question, I would say: It takes half an hour or longer. The text says the first REM period may begin half an hour after falling asleep. It doesn't say that always happens.
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If I had to answer that question, I would say: It takes half an hour or longer. The text says the first REM period may begin half an hour after falling asleep. It doesn't say that always happens.
CB