Sleep Environment for Twins
If it’s not possible to separate, and as a parent you want them to share a room, then twins should always be trained in the same room for naps and night sleep.
They can remain in the same crib until up to 4-6 months of age. Around this age there is more movement so it is a good idea to separate.
When sharing a room sleep training might be a slower process
Sleep environment must remain conducive, safe, and consistent.
Sound machine is very useful and there is no need for dividers.