hye, i am a medical student. i smoke ciggarates, not drink and dont take drug. my age is 22 yo. dont have any health problems. 1 operation on acl procedure, git prob during kids, now dont have. i usually sleep at 6 in the morning and woke up at 5pm in the evening. but today i need to attend my class, so since 5pm yesterday i did not sleep and attend a class which start at 9am. b4 going to class i ate rice with egg and carrot at 6am. 9am, im having a lecture and then at 1030am im having my clinical training which is at operation room and it was a first time i entered the operation room to see a surgery of kidney transplant. at first everything is normal, i watch carefully the surgery without feel sick or scare with blood and also the operation, after about 45 minutes while i keep my eye on anestheslogist injecting something to the iv fluid i started to feel lightheadedness and drowsiness with NO nausea and uncomfortable in heart . i decided to step out from the operation room and when im consious after 1-2 min i already lying on the bed. my bp was measured and it is normal my question is 1) is it because of my 1st time entering the operation room or lack of sleep and hungry? if both which comes first? 2) is there any problem with my heart or nerves?