context: "A review study on nap timing/time and length showed that a 120- minute nap in the first half of the night and an about 60- minute nap in the second half can help maintain alertness in the period following the nap."
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"A review study on nap time and length showed that a 120-minute nap in the first half of the night and an approximate 60- minute nap in the second half can help maintain alertness in the period following the nap."
Say eg "A study of nap timing and length showed that a 120- minute nap in the first half of the night and a nap of about 60 minutes in the second half can help maintain alertness in the period following the nap."
I'm surprised that you consider a 2-hour sleep a nap!