I am assuming that you have gone on your holiday by now, but I just wanted to add my two cents worth here.
I too wear hard contact lenses. I also have a pair of glasses that I can use for a back-up when I lose a contact or when one of the contacts becomes damaged.
Even though you can never see as well with glasses as you can with contacts, because the focal point for your vision is closer to your eye with contacts, it is important to have glasses in case something goes wrong with the contacts.
As far as sleeping with hard contacts still in - don't! I have before and it's not good! It can be very painful afterwards if you sleep with them in for a number of hours.
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