One twin lets out a cry, and before you have even sat up the other is awake too. Now instead of settling one baby you are settling two, and the night that was going fine has come apart.
Twins waking each other is one of the most predictable frustrations of sharing a room, and the good news is that it usually fixes itself as the babies get used to one another.
Help them tune each other out
Babies habituate to familiar sound. A steady low background noise softens the sharp edges of a sibling's stirring, and quick, quiet resettles mean the disturbance stays small. Over a few weeks most twins learn to sleep straight through each other's brief wakings.
When separating helps
If the waking is severe and relentless and no one is sleeping, a temporary separate sleep space can break the cycle. Treat it as a short-term tool rather than the plan, and follow safer sleep guidance for wherever each twin sleeps. Most families find they never need to go this far.