usage of phrasal verb conked out

I worked hard today. After returning home, I conked out on my sofa

Since three days, I have been not getting sleeps due to exams. Finally, after exams I conked out continuously for six hours.

2 answers

The only correction is to change Since three days, I have been not getting sleeps due to exams.
to
For three days, exams have kept me from getting enough sleep.

The rest is fine.
it sure is grammatically correct but not with few errors....instead of saying "since three days", "for three days is more correct"....therefore saying "for three days, i have not been getting enough sleep due to Exams" is good