It's understandable to be confused—home monitoring of respiratory rate is sometimes recommended before or alongside formal sleep apnea tests, often to gather preliminary data or help rule out other issues. While full sleep studies (like polysomnography in a lab) measure many variables, at-home tests and self-monitoring typically focus on breathing patterns, airflow, and oxygen levels, but may not capture sleep stages. As for the numbers—if your respiratory rate varies a lot, it can be due to differences in wakefulness, activity, or agitation; rates are generally steadier during sleep and more variable when awake or moving, so it's normal to see some fluctuation if you're recording at different times. If concerned, keep tracking and share your results with your doctor—they'll interpret the patterns in context and decide if further testing is needed.