[Communitivity]

I went through a period of my life over several years where I did this. I was pretty much on, checking emails and responding whenever I was awake. I found it to be a horrible life balance when I finally stopped, realized my health had deteriorated and I had missed key moments of my daughters early life.

If the company will truly fall apart when you become unavailable, then you are doing it wrong. Hire people you can trust, train them, maintain well-defined processes in some Body of Knowledge repository. Then let people know who to contact for what. Give clear and accurate criteria for the emergencies when you should be called/texted. Then be present always, whether it is work or vacation. You'll find your happiness increases, your job output increases, and the people you work with will grow and be happier for it.