I swear they are in cahoots.
DD woke every 90 minutes between 7pm and 5 am apart from a window of 2 hours 50 minutes between 11pm and 2am, by which time I'd given up all hope.
At 5am DS took over with 'a bogey'that needed wiping, a wee at 5.50 and misaligned teddies at 6.10.
His gro clock goes yellow at 7, at which point the endless steam of 'why?' questions will begin again.