While it certainly sounds like you've got enough stress going on to be the cause of your problems, it might be a good idea to rule out any physical causes, disorders like sleep apnea could be behind this...
About 12 years ago, I was constantly sleepy & irratible, & having serious probs drifting off at the wheel...a sleep study determined that apnea was interupting my sleep several times a night, & a CPAP unit prescribed (that Mrs Zoid describes as "Darth")...while apnea is more likely in men (due to a larger soft pallette), women are by no means immune to it.

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