Hit my head, please help?

I hit my head about 40 minutes ago it doesnt hurt right now AT ALL, but im really really tired, and i wasnt even a little tired 50 minutes ago, i heard that if you fall asleep you could die and im really tired but i dont wanna fall asleep cause im really scared, i dont feel nauseous but i think i feel kinda dizzy (maybe cause im really tired and i can barely keep my eyes open) but i dont wanna fall asleep and never wake up (die) cause i heard this happened to alot of people and the thought they were ok but they died. I feel a TICKLISH SENSATION INSIDE MY HEAD, like its really weird, its just tricking, i dont know what it is, but i dont want anything to happen, my mom says im fine but idk, can you really fall sleep and die? please help