Just as sure as night and day, sleep is a part of life – not just a part, but an integral part. It’s the way we are made. Machines can be made to run day-and-night weeks at a time, but not the human body.
The questions of How much sleep is enough? and When is it too much sleep? are addressed by several persons and organizations in books and articles and online. Frankly, there is not total agreement on the answers, though there is some general agreement with differences on particulars.