After falling asleep, when does a person typically experience periods of alpha waves?
A. At the 6th and 7th hour
B. At the 1st and 2nd hour
C. At the 3rd, 4th, and 5th hour
D. At the 2nd and 5th hour
Correct answer is option A. Explanation: After falling asleep, at the 6th and 7th hour a person typically experience periods of alpha waves.