Once apon a time I was a project/contracts manager in the construction industry and had to quit thro stress and lack of sleep and since then I've had the chance to analyse the sleep problem. When I took to a more physical job the 20yrs of insomnia just ended and only occasionally come back.
The tell tale comment you made is the waking up early no matter how exhausted you are and I can assure you this is down to stress and worry. I'm guessing most of the worry is about you and everyone else getting things done. I'm afraid a holiday is only a short term remedy and lack of sleep makes you less efficient which leads to more stress then less sleep and so on. I didn't like going to sleep early as it made the morning come sooner and I dreaded mornings.
One thing that really worked for me was to keep a clipboard with lined paper and simply write notes before bed which helped me switch off. Basically a to-do list.
I don't know how fit you are but exercise, especially cardiovascular, works wonders. You'll sleep much more soundly.
I also learned relaxation techniques to do prior to getting to sleep which helps the waking up early problem....takes a while to get the hang of it but well worth it. It involves breathing and muscle tension....very effective.
Just a couple of tips I hope are useful. I only have to worry about running 3-4 employees now as opposed to 50 previously but things still get to me occasionally.
You sound like you may need to reassess your working practice to reduce the old stress. A bit of it is great but too much is a killer.....sometimes literally.
Take care,