I think u take lots of stress now a days.That is why ur brain works much more time and get less tine to rest. Take proper sleep minimum 7-8 hours per day and take proper exercise Regular.

Hi, Get your full body check up. Make a routine exercise. have lots of fresh fruits and dry fuits. fix a time for sleep and waking up. all the best for any stress consult.

Hello Based on you description of your concern.it appears to me you have fatigue ,unrefreshing sleep ,poor concentration ,felling low and accompanied with stressors like competitive exams.if u have told me the duration of your symptoms it would have been better.but appears you might have a mild form of depressive episode.kindly consult a psychiatrist for appropriate treatment

Your symptoms are suggestive of depression. But confirmation of diagnosis can be made after a clinical interview. Please visit a mental health professional.