It really depends. For the most part, no. I have to set literally 10 alarms and I still won't wake up. I skipped probably a quarter of my morning classes during my senior year. But it depends what stage of sleep I'm in. If I've slept for 3 hours or less, I can wake up easily or if I sleep 8 hours or more I wake up easily. Any time in between, I'll be in a stage of sleep where I just can't get up.