When a ferret sleeps more than usual does that mean they are sick?

Not necessarily. It is normal for ferrets to sleep for long periods of time, typically 12-14 hours a day. Factors such as age, activity level, and environment can affect how much a ferret sleeps. However, if a ferret is sleeping significantly more than usual and showing other signs of illness such as decreased appetite, lethargy, or changes in stool, it is important to take them to a veterinarian as it could indicate a medical problem.