You've been lying awake next to your bed partner for about five minutes. as you hear the other person's breathing become rhythmical, you notice occasional slight twitches in your partner's hand and leg. most likely, your bed partner is in:

Most likely, your bed partner is in stage 2 NREM.
NREM refers to non-rapid movement sleep, and has three stages. Here, we are talking about the second stage of NREM, which means that this person hasn't started dreaming yet. However, he or she is not experiencing any eye movement at this point, and can be easily awakened.