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You have drowsiness
even your CPAP machine advising you of a good sleep. Most likely the tiredness is due to associated depressive disorder. Although you are on Escitalopram 10 mg. still depression
may be a possibility for the tiredness in you.
Secondly you are 6'4'' and your weight is 120 kg. It is about 30 kg more than the recommended weight for your age and height. Due to obesity increase in both apnea
and depression risk occurs. So I advise you to try to decrease your weight.
Even after cpap you are having tiredness then visit your doctor again and if no relief occurs, visit your psychiatrist
for expert opinion for dose adjustments,
Dr. Seikhoo Bishnoi