It is 2pm. One twin has finally gone down. You tiptoe out, and the other one is wide awake and ready to play. By the time you settle the second, the first is stirring. You have not sat down since 6am.
When twins nap in opposite shifts, you never get the break that makes the day survivable. The good news is that overlapping naps are usually a timing problem, and timing is something you can move.
Why they drift apart
Each baby wakes at a slightly different time, so their next wake window ends at a different time, so their naps land in different slots. Left alone, two babies invent two schedules. The fix is to reset the clock at the same moment for both, every morning, and let the day follow from there.
Start with the morning, not the nap
The single most effective step is matching the wake time. When both twins start the day together, their nap windows land together too. From there it is small nudges: waking the lagging twin, offering naps on the window rather than on cue alone, and keeping resettles calm.