In a few minutes the labor-pains returned and the feet of a second child presented, and the child was expelled in three pains, followed in ten minutes by the placenta.

Here is an authentic case in which labor progressed to the second stage during sleep.
Weill describes the case of a woman of twenty-three who gave birth to a robust boy on the 16th of June, 1877, and suckled him eleven months.
This birth lasted one hour.

She became pregnant again and was delivered under the following circumstances: She had been walking on the evening of September 5th and returned home about eleven o'clock to sleep.

About 3 A.M.she awoke, feeling the necessity of passing urine.

She arose and seated herself for the purpose.