WHY did you have an 'oxygen and heart rate test' done, and by what type of 'doctors'? What did these doctors tell you about the results of these tests?
Are you currently under a cardiologist's care?
had an oxgen and heart rate test done while sleeping by the doctors
You Should discuss this with your doctor. This value is very low and you should be evaluated to determine the cause.
How do you know your heartbeat while sleeping might be 25?