Question

The stages that comprise sleep, as well as sleep latency onset, are collectively called ________________. (1 point)

Answer 1

The stages that comprise sleep, as well as sleep latency onset, are collectively called slow-wave sleep (SWS).
They occur during the first third of the night. Stage 3 lasts only a few minutes and constitutes about 3 to 8 percent of sleep, while stage 4 lasts approximately 20 to 40 minutes in the first cycle and makes up about 10 to 15 percent of sleep.