Why is this the answer?

The answer is fly because this clever riddle uses fun clues to describe the daily life of a common housefly. Think about what a fly does all day long! This riddle is tricky because it makes you imagine a person doing these things, but all the hints point to a little insect. First, let us look at the line, "Who spends the day at the window." Flies absolutely love sunshine and warmth, and windows are the best place to find both inside a house. You can often see a fly buzzing against the window glass. They are not trying to look outside; they are actually attracted to the bright light. Sunlight helps them warm up, which gives them the energy they need to zoom around. That is why they spend so much of the day hanging out on the windowpane, waiting for the light to keep them active. Next, the riddle mentions the fly "goes to the table for meals." When you are enjoying a sandwich or a sweet treat, a fly sees an opportunity for its own meal. They have a great sense of smell and can sniff out tasty food, like crumbs, spilled juice, or even a nice piece of fruit, from far away. A fly will land right on your dining table, or your food itself, trying to grab a bite. This part of the riddle describes how they visit our tables to share uninvited in our meals. They are very focused on finding any little speck of food they can eat before they get shooed away. Finally, the riddle asks who "hides at night." When the sun sets, the house gets cooler and darker. Flies are cold blooded, which means they need the sun's warmth to be active. When it is dark, they get very slow and tired. They stop flying and buzzing loudly and find a snug spot to settle down for the night. This spot might be on a high ceiling, in a corner, or even just stuck quietly to a wall. They are "hiding" because they are resting and waiting for the morning light to return and give them the power to fly again. So, the fly is a little creature with a simple but busy schedule: window time for sun, table time for food, and quiet hiding time for sleep.