Answer:
b. Both our respiration and heartbeat slow down
Explanation:
The stage 1 sleep is the phase where one falls to sleep. During this phase, the overall muscle tension, and the core body temperature reduce significantly as the rate of respiration and heartbeat slows down.
Brain wave activity of an individual during the stage 1 sleep is depicted as someone who is relaxed but awake. This can be visualized with the aid of EEG. Alpha and theta waves are associated with the stage 1 sleep.
