Working Full Time, Study Part Time vs Study Full Time, Working Part Time

After having classes for half semester, I realise something..
When I was still studying full time, I can manage with my part time job, not feeling that tired.
But now, when I start working full time and having classes at night, I cannot take it.
I'm extremely tired!
Why is that so?!

Deadline deadline and more deadline!
All my assignments to submit by next week and examination in two weeks time!
I need to pull through, I can pull through, I will pull through!
Alright.. enough of complaining..
Time for assignment or knock out!
Good night! :)

PS: Thanks Javier love for being there for me all these while :)