Can Drowsiness And Stress Be Due To Intake Of Resytl?

Hi, My age is 29, because of of my woek load , i used resytl 0.25-0.5 . For some time i used it rarely and after that i used for 1 month. in mean time i was feeling so deepness nad drowisness , u was shocked and was nable to find out what was happening with me, Later on i realised it was sleeping pill, then i have stopped immedtaily. Now it is almost 3 weeks that i have stopped but i feel i bit drowiseness and tend to think too much, Is this is effect of the pill i used in the past or it is just my imaination?