If you're concerned that your sleep is too shallow, you may have sleep apnea syndrome?! And it could lead to hardening of the arteries, heart failure, or high blood pressure...?!
Regardless, if you think you're sleeping 
fine, but feel tired during the day...
مهما يكُن، إن كنتَ تعتقدُ أن نومك طبيعي
...لكن تشعرُ بالتعب في أوقات النهار
Auch wenn sie glauben gut zu schlafen,
aber tagsüber häufig müde sind ...
Comunque, se pensate di dormire bene, 
ma vi sentite stanchi durante il giorno...
Por sinal, se você dorme bem e 
tem ficado com sono durante o dia...