Well, I suppose if you think you may pop off and only be discovered, half eaten by Alsations, several weeks later, it's a good idea! I had to resort to having one of those rape alarms in my bedside drawer. As although I live in a house full of people, they wouldn't notice if I was dead until they were sitting at the table with their knives and forks in their hands and realise there was no food in front of them! Joking aside, it came in useful once (so mock me not!) as I had a reaction to a drug I'd been given when I was ill and collapsed. Pressed my alarm and OH came running by which time I was barely breathing. Dialled 999 and was resuscitated by paramedic and shipped off to hospital to have the drug flushed through. So without it I wouldn't be here typing this long and interesting!!! post!
I think if a text each day reassures your family, who may worry about you otherwise, why not.