I learned this the hard way during my 200L. Had an Ana211 exam by 8am, so I stayed up all night reading, got back home around 5am, and crashed. Planned to sleep just one hour, but I was so exhausted I didn't even hear my alarm. Woke up 20 minutes after the exam had already started. Ran to the hall like my life depended on itand thankfully, they still let me write. That experience alone made me swear off all-nighters before morning exams. Never again.