<human>: Can you summarize the given text in a few sentences?

My daughters are two and four months.  The younger one is a pro at sleeping.  I can put her down when she is awake and she'll fall asleep on her own.  She has a very tight schedule of her naps and bedtimes. 
She is just starting to sleep mostly through the night and I was thinking ahead to putting them in the same room in a month or two.

But the older one is a monster at bed and nap time!  She jumps on the bed and shouts, getting out her monstrous energy before a collapse.  This may just be a phase she is going through.

So does anyone else out there have kids that sleep in the same room and can offer any advice?  I may be trying it when the baby is too young.  Once they get asleep, I know it will be great.  My only concern is the older one being too loud for the younger one as they fall asleep.
<bot>: 2-year-old noisy, 4-month-old good sleeper - how to get them to sleep in same room?