Yes. Where most small pets are quiet or at least asleep at night, sugar gliders are vocal, active and awake for exactly the hours your household is trying to sleep. Their sounds are not especially loud in a daytime sense — nothing like a dog — but they are sharp, strange and repeated through the small hours, and they come from an animal that is also racing around a large cage, leaping between branches and rattling whatever can be rattled. People who research gliders thoroughly still name the noise as the thing that surprised them most, usually from the far side of a bedroom wall.
The glider sound catalogue
The signature sound is crabbing: a loud, harsh, rattling buzz, something like an electric razor crossed with a cicada, produced by a startled or annoyed glider and startlingly loud for an animal that fits in a hand. Barking is the other famous one — a small, sharp yip, not unlike a tiny puppy, repeated in bouts, often in the middle of the night and often aimed at getting a response from the colony, the household, or apparently the moon. Around those two sit quieter hisses when irritated, soft chattering and clicking during social time, and little sneezing sounds made while grooming their faces with spit-dampened hands, which are normal and rather charming.
Why the timing is the real problem
A glider's noisy hours run from after dark until near dawn, every night, for a lifespan that can reach well past a decade. A cage in a bedroom is untenable for all but the heaviest sleepers, and a cage in the next room is still audible in a quiet house or a flat with thin walls. Barking bouts can also be contagious within a pair or group — one glider starts, the others answer — and lonely gliders bark more, because the sound is partly a call for company. This is not a pet whose noise you can train away or wait for it to outgrow; night noise is simply what a healthy, active glider produces.
Reducing the noise you can reduce
Some of it is manageable. Gliders kept in pairs bark less from loneliness, a consistent light cycle settles their rhythm, and a solid evening of interaction before the household goes to bed takes the edge off the first active hours. Cage placement away from bedrooms, soft fleece pouches instead of rattly plastic houses, and a glider-safe wheel on a quiet bearing all cut the mechanical share. What remains — the crabbing at a strange shadow, the barking at nothing you can identify — is the authentic soundtrack, and a household has to be able to smile at it, because it is not stopping.
When a noise means more
Crabbing aimed at handling is information: the glider is frightened or does not want to be touched, and forcing contact teaches it to escalate. A glider that becomes unusually quiet at night is a bigger concern than a loud one — a glider off its food, sitting hunched and silent through its active hours, should be seen by an exotics vet promptly, since prey animals hide illness and a change in the nightly noise pattern is often the first clue an owner gets. For those midnight puzzles, put a follow-up question to KinsLe's Kimmy; she answers using the KinsLe Answers library.