Lyla can sleep for hours on end:

But when she’s awake, she’s very, very awake.
Today I popped up the road to buy some groceries and lunch when she was an hour short of her four-hourly feed. Just as I’d bought a bagel and sat down, I texted Stu to see whether she was still asleep. No, he replied, she was screaming her adorable little head off. So I bolted back.
Then for dinner we headed off to a Greek restaurant just a few blocks away (after deliberating over whether we should still go amid the small-scale bombs going off across the city…) with A, A and J. Nannie and Papa took Lyla under their wing, but just as mains were arriving came their call for help — she was screaming her still-adorable little head off. So I bolted back. Seems she was either crying from hunger, despite having just had an enthusiastic feed, or more likely, she was enraged over her poor little bottom coming down with a case of nappy rash… So no more leaving Lyla for a little while yet.