Let me introduce the child who doesn't sleep (much).
dd sleeps 7pm-7am with a two hour gap in the middle when she thinks it should be playtime. On a good day she'll then sleep for 1/2 hour mid morning and 1/2 hour mid afternoon.
The rest of the time she's happy and wide awake.
She's surviving on 11 hours sleep. She's 10 months old fgs. I realise she's thriving on that, but it exhausts me!