Saturday morning I had an ice hockey game at 6:30 AM . This meant I had to wake up at 5:30 AM , stumble around the house gathering up my gear , and be out the door around 5:45 AM to make it to my game early enough to get dressed . A fun but difficult start to the weekend .

Question: What may be the reason I stumbled around after I woke up on Saturday morning ?
Answer: None of the above choices .I am used to getting up much later in the morning than I did this morning .I had a difficult time sleeping last night because I had to work late on Saturday .I was at the ice hockey game late last night and was still so tired .