dsps is a circadian cycle problem. it means your sleep wake cycle doesnt match in timing with external time zone. you fall asleep late. to correct this problem there are variety of sleeping aids like benzodiazepines the one you taking, melatonin which is natural hormone And it correct cricadian rhythm, you can also try some sleep hygiene measures like fix your wake up time , dont take naps in afternoon, dont take tea coffee specialy in evening hours, dont eat ,read on your bed,of cant fall asleep dont keep lying on bed instead get up go to living room and read a book after sitting on chair, go back to bed only when you fafeel sleepy