I know when I'm exhausted.
The signs are very clear.
This is different to being my "normal" tired where the soundtrack to a Huggies advert makes me cry, or finding the dishwasher hasn't been unpacked AGAIN makes me break out in a round of muffled expletives.
No, this special kind of tired is where I get hysterical. I get the giggles at everything.
Last night my bed resembled a warzone. My husband is away for work again and the children are very unsettled. By 4am I think every single one of my chicklets had visited me nocturnally at least twice.
They all expressed their tender concern for my well being and offered to make me a cup of tea.
Actually that last bit is a lie.
One had a wobbly tooth he had to show me RIGHT NOW (2am)
One had friendship trouble (She's 5, oh dear Lord)
and Mr Small?
Well he was just, you know, checking in.
By 4am however, they were all, I mean ALL piled up in bed with me. And all I could do was muffle my giggles. Because it's been nearly 48 hours now and I don't think I've slept.
AT ALL.
Another case in point regarding my hysteria.
This week on Facebook the idea is that you post up a picture of a famous person you or your family and friends think you look like.
Lots of my friends have posted up pictures of glamorous people and famous beautiful people. It's startling actually how beautiful many of my friends really are. Sigh.
This was my choice.

Now, on the rare occasions I've checked in with Facebook today I've been left comments by concerned family members asking who on earth suggested Susan Boyle as my doppelganger. Kind friends have posted up alternatives.
And despite the fact that I am earth shatteringly tired I haven't stopped laughing.
Because to me Susan Boyle's excitement and enthusiasm in this photo IS exactly like me.
And hey,
she's laughing all the way to the bank.