7yo dd does this sometimes (tbh she usually doesn't settle so early). She's tired, snuggled and ready for bed around 7:30. Dark cosy quiet room, quiet for 15 mins. Then lots of trips out of her door and lots of gentle returns from me. She is obviously shattered. Then an hour or so later she flips out. And I'm being kicked and hit and having to take missiles off her and keep her as safely under control as possible. Then we have an hour of chaos before she konks out.
Tbh I'm so tired I find it hard to gauge what's going on but this morning I've been pondering whether the poor little bean has some kind of adrenaline rush at the wrong point or its hormonal. It seems odd that a child can go from sleepy and flopped in bed mayhem an hour later.
Thank you if you've read this far. Off to work now to main line tea.