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. <span>Stage 3 lasts only a few minutes and constitutes about 3 to 8 percent of sleep, while </span>stage 4 lasts approximately 20 to 40 minutes in the first cycle and makes up about 10 to 15 percent of sleep.
The proper definition of momentum is <span>the quantity of motion of a moving body, measured as a product of its mass and velocity. Your answer has slight issues.</span>
