2yo sharing a room with 5mo?!

Our son will be 2 years old next month and sister will be 5 months! They will have to share a room. She sleeps through the night (wakes up at 5 am but I’ll take it) sometimes waking up once to eat. Our son was in is own room around 5 months and I remember it being an adjustment but maybe took him a week to get the hang of it. Sister usually goes to bed an hour earlier and wakes 1-2 hours before brother. I guess I’m just worried one will wake the other and then have to kids up. Just wanted some experiences with an infant and toddler sharing a room! Tips?!