Hello Friend, Thanks for reaching here for help. I can understand you suitation. No sleep or disturbed sleep happens due to various reasons  from body functioning issues or  due to stress in your mind.  You need to understand that min 8hr sleep is must only if you are into physical work. But if you do less physically and more mental work, then you need rest + sleep. During this rest time, the mind does all reconciliation work for that day and then gets into sleep. Looks in your case, you are not having proper rest.

U might be suffering from depression and tension headache. Consult a Psychiatrist and get counselling along with medicine. It will be very helpful in ur speedy recovery.