2yr old won't sleep in same room as 5yr old - gets hyper

[Anya4]

Advice needed - 2yr old dd takes ages to get to sleep and gets really hyper when her 5yrs old sister comes in to go to bed.
Advice needed ! they sleep fine in the same room if they are both asleep but just don't find it easy to get to sleep together. (2yr old still naps, so I wonder if that is part of the problem - she's not tired enough at bedtime)

Anyone got any experience with this ??