Answer:
The doctor might suspect that Helle is suffering from sleep deprivation.
Explanation:
- From the symptoms that Helle mentioned to the doctor, it is clear that Helle has been behaving absurdly because she has not been able to give her brain enough time to rest and has been engaged in brain-tiring activities.
- Hence, out of all the other possible reasons behind Helle's reduced temperament and lack of concentration, the doctor might primarily find sleep deprivation to be the most obvious one.