I've heard that tiredness itself can't make you ill but can make you run down.
I have ds 2.10 (never been great sleeper but better recently) and dd 6mo, bf through the night so don't get that much sleep but could be worse.
I'm used to feeling v tired but muddle through. Ds has nursery tues afternoons so that's my one opportunity for a daytime nap (weekends sometimes but we're usually out/ family things)
This morning I was up at 6am with dd after a few night wakings so not too dreadful but from about half 8 started feeling v sick, dizzy, eyes droopy just want to sit/ lie down but with two small children that's not easy!
So can tiredness make you feel so ill?? I hope this doesn't last all day 