How Does It Work?

The key to this technology is the body’s resting heart rate while sleeping.

When your body is fighting an infection, your heart rate increases as your immune system kicks in. This elevated heart rate can be detected even before you start feeling the symptoms of the cold or flu.

Cardiogram’s new Sleeping BPM feature monitors a person’s heart rate and tries to identify these heart rate increases that are associated with illness.

“Cardiogram’s new Sleeping BPM feature can help users become more aware of how their body is responding to symptoms of the flu or other illnesses including COVID-19,” said Johnson Hsieh, Cardiogram’s co-founder to AppleInsider.