Woke up at 3:30 am , could n't get back to sleep . It sucks . Two days ago I was still drowsy and sleeping all the time . I still want to sleep all the time , but it is not happening .
What may be the reason I can not go to sleep ?
Pick the best answer from the following options:
- I have to work nights ,
 - I have insomnia .
 - I have to study .
 - None of the above choices .


I have insomnia .