Am I in the wrong??

So my sister called me this morning to come over and wake my niece and nephew for a hour (my niece is 9 and nephew is 5) while she did her clinicals for school. Her mother in law is here but according to my sister she doesn't feel good and thinks she has a stomach bug. But her mother law has been up and awake this whole and the kids are entertaining themselves. Normally I wouldn't be upset because it is what it is but I have really bad insomnia and is currently gonna be 23 weeks pregnant tomorrow and I also work a full time job (and when I say full time I mean like 50 hour minimum a week) and I wasn't able to fall asleep till like 12 something last night but then woke up at 3 something and wasn't able to go back to sleep till like 8 or 9 this morning and was woke up at 10:15 from the call and I work at 3 I was told I was only watching the kids for a hour 12-1 and it's currently 1:30. Am I in the wrong for being upset and irritated or am I just overreacting??