You generally do not need to turn off the monitors manually, as they are designed to shut down on their own. However, if a monitor is still running, here’s what to do:

Sleep Apnea Monitor (SAM): If the SAM is still powered on when you wake up, press the power button two times quickly (a rapid double-tap) to turn it off.
 
Oximetry Watch Monitor: First, remove the watch and ring sensor. The monitor should turn off automatically within one minute. If it stays on, press the power button once on the side of the watch.