Toddler and baby room sharing

any mamas with experience (or plans) to have their toddler and younger baby sibling share a room? We only have a 2 bedroom, and though it’s down the line, we know eventually we will need them to share a room. I worry because my 20 month old is just such a great sleeper (slightly sleep trained him). Any experience or advice? Of course my mama brain is working over time stressing about something that hasn’t even happened yet 😅