Owning a single sugar glider is not recommended for their well-being. Sugar gliders are highly social animals, and keeping them alone can lead to significant stress, loneliness, and even self-destructive behavior. While they won't die from actual loneliness, they will not thrive in isolation.

Lonely sugar gliders may become depressed, untamable, and engage in self-mutilation. They might chew off their tails and fingers, and these body parts won't regenerate. Sugar gliders need the companionship of another glider for their mental and emotional health. They naturally sleep in close contact with each other, emphasizing their strong need for social interaction. 

To put it simply, having just one sugar glider is like subjecting a young child to solitary confinement. While they may survive physically, their mental and emotional well-being will suffer. It's not a kind or responsible approach to their care. Attempting to replace another glider with human interaction is not a viable substitute for their need for a companion. If you can't provide them with the social interaction they require, it's advisable to reconsider owning sugar gliders.  

Sugar gliders thrive when they have a companion, as another sugar glider can be one of their best sources of entertainment. When you have two or more gliders, you'll witness them engaging in playful activities like tag, hide-and-seek, and follow-the-leader. They spend quality time together, snuggling in their nest for naps and grooming each other. They also "talk" to each other through sounds unique to sugar gliders. These social interactions help keep them occupied and happy, especially when you're not available to interact with them. Just like they need food, they have a strong need for companionship to lead fulfilling lives.