Short on Patience!!
Why have I been feeling snappy, irritable, impatient? I haven't been sleeping. Every person deals with the occasional interruption of slumber. But when we can't sleep, we get moody.
That's one of the things insomnia does to us. Here's some good read about other things insomnia does to us, with both why stress interrupts sleep, and how to stop it: http://www.huffingtonpost.com/2014/09/17/stress-and-sleep_n_5824506.html