Another Classic Riddle?

Question

Okay, boccalones ~

Before going to bed each night, a man locked all of the doors to his house very carefully and deliberately. Once his doors were locked, he placed the key to the front door inside a bucket filled with cold water. Each morning the man reached into the cold water in order to retrieve the key to open his front door. Why would he do this?

10 points are waiting!

Answer 1

To check either the water still cold or not. If it doesn't it means, its a day.

Answer 2

So he would wake up because he was sleep walking.

Answer 3

He must have been a Sleepwalker and since he had locked the doors to the house, he couldnt get out without unlocking the doors first and since the key was in the cold water, he would end up waking up when he reached into the bucket.

Answer 4

Because he'd sleepwalk out the front door and the water would wake up. He only had one door.