Hello purplicious,
I have worn contacts for over 20 years, and I love them — I miss my peripheral vision when I am in glasses, and with my contacts I can still see clearly underwater when I swim with goggles on. Some brands are designed for 24-hour wearing for a certain number of days or weeks, but I am guessing that yours are not. My experience with the napping and sleeping overnight in contacts is like Wolfish Musings’. I change pairs every 2 weeks. I find that, by the mid-to-late evening, my eyes tend to feel dry, even if I haven’t slept in my contacts, at which point I tend to switch to my glasses unless I go to sleep. Hope this helps! 🙂