Wake the baby up?

Yesterday Christian took about an hour's worth of naps.

Last night, he didn't go to sleep until 10:15!

He was awake at 6 am, so I fed him and he went back to sleep.

It's almost 9 am, should I wake the baby up? Or should I let him sleep due to his "lack of sleep" yesterday?

I think he also has a sore throat, so he probably doesn't feel good.

If I let him sleep in, then I will be up til 11 pm tonight with him!