My 2 have shared a room for 2 years now and our routine is still the same.

Bath, pj's together and then DD2 goes to bed between 7 and 7.30. She has 2 books and chooses her bedtime music from the iPod. She goes to sleep. DD1 does her homework reading from school while this happens and gets to sit with DP & I to have some time debriefing about her day. She goes to bed around 8pm and chooses her bedtime music from the iPod (DD2 will be asleep and her music finished by then).