We put DD into her toddler bed when she was about 20 months because she was climbing out of the cot.

It DID make bedtime harder as she kept getting in and out of her toddler bed but I eventually figured out that I would keep the routine the same. Read a story or two, regardless of whether she was in or out of bed and then leave (after giving plenty of warning ie. "mummy read this book then mama go" times about 50).

We also have a single bed in her room and she's just started sleeping in that (she's now 2 years 3 months). Was her decision really - we don't have any rails on it but the floor is carpeted so I'm not TOO concerned about her falling out.

Bedtime is still a bit of a shambles compared to the easy days of a cot but no, she doesn't play up during the night. We have found her on the floor when we check on her just before we go to bed so I think sometimes that's where she falls asleep (rather than falling out of bed) as she's a long, long way from the bed. We just put her back into bed when that happens and she barely stirs.