I take lisinopril 30mg once daily, i believe i took it twice this morning within a hour. i've felt drowsy most the day. will i be okay to go to bed an take it as normal in the morning?

If you have a self monitoring system at home it may be good to be guided by your past & present readings. The time for all the med to leave your system is 4X the 12 hour half life, so if you took the second dose, med may remain for 2 days at an therapeutic level. Missing a day if your BP is/was not on the higher side is likely okay occasionally. Find a dated pillbox & take meds from that.