6 yo waking in the night for hours!

[BrinjalPickle]

My 6 yo wakes every couple of weeks in the night and can't get back to sleep. Last night she was awake between 1.30 & 4 so today she's shattered & I'm shattered. She woke up initially as she needed the loo, then came through about an hour later as something else was up then about 30 minutes after that she came through as she was scared. She shares a room with her sister (through choice - both of them) and we leave a lamp on on the landing.
Does anyone have any good suggestions for helping her get back to sleep more quickly?

Sorry, no advice but my 3yo was the same last night. He woke around 12am for a wee and a drink, settled back down but then woke again about 2.30am and was awake for an hour for no particular reason. He doesn't get out of bed but constantly shouts me through. I think he was just hot. He didn't this about once every few weeks also and sleeps through the r at if the time so I just get on with it. Plus side is he has a lie in after a night like that usually (although I had to get up at 7 today )