For naps? at night? to what age did they stay together?

Ours are 7 weeks and have been sharing at night but have noticed they are stirring each other more lately overnight and am wondering if separate cribs or rooms would help them sleep better. We're dealing with lots of wakeups the last week or two!

Lately they have napped apart in bouncers in the same room. But I just got them both to take their morning nap together in their crib. Maybe they just need more familiarity being closer while asleep and in the crib?

And any other thoughts or advice on twin sleep is welcome too