Assuming they don't need to be up for daycare or something else?
E went down at 9:30 last night, woke up once at 7 (woot!), back down by 7:15 and is still asleep (it's almost noon here--he's usually up at 10ish).
He wasn't feeling well and had crappy naps yesterday so my gut is to let him sleep, but at this point I'll need to rearrange his naps times today.