Last night I was sitting here mumsnetting being very productive. All the DCs were in bed. DH had locked the doors and I had told him I would come up in a minute. SIL (DHs sister) text me asking could she come and visit. She visits a lot at night, because she says it's easier for her.
I said no we were all in bed. I then fell asleep on my chair 
DH left me where I was. So I didn't wake up till this morning. I had 9 missed calls and 16 messages from SIL most of them telling me to call her back soon.
I rang her back and told her I was sorry, I had fallen asleep.
She said I was rude for doing so and she wanted to come. I said I was sorry, I really didn't mean too. She told me to get lost and she wouldn't ask me again she would ask DH from now on.
I feel really bad now, because she is upset. But at the same time I didn't do it on purpose.
So AIBU?