After we turn out the lights at night and fall asleep, it generally takes us __________ minutes to fall into a deep stage 4 sleep.
A) about 90
B) about 120
C) less than 60
D) about 180
E) about 100

Question

Quizplus · Accepted Answer

The Answer of After we turn out the lights at night and fall asleep, it generally takes us __________ minutes to fall into a deep stage 4 sleep.
A) about 90
B) about 120
C) less than 60
D) about 180
E) about 100

After We Turn Out the Lights at Night and Fall