Helle visits her doctor and explains to the doctor that she is having trouble concentrating on her final exams at college and is very short-tempered with her roommates. The doctor asks Helle if she has been sleeping 6-8 hours each night. What may the doctor suspect that Helle is suffering from?

The doctor might think she is suffering from sleep deprivation. Sleep deprivation can cause a number of surprising symptoms, including a change in mood, difficulty concentrating or thinking, decreased immune function, and weight gain, among many others. Sleeping less than six to eight hours per night can cause sleep deprivation. The doctor was probably suspicious that this might be causing Helle's symptoms.