Based on this information, the researcher can conclude that Ryan "has just entered Stage 2 sleep".
Stage 2 sleep, which for the most part keeps going around 20 minutes, is described by an abating pulse and a reduction in body temperature. Your body lessens its action to set you up to go into a profound rest.
It winds up harder to wake you up.
Your brain begins to produce bigger waves.
Your circulatory strain likewise diminishes, and other metabolic capacities back off as well.