Slowly learning to take a whole day off each week, it’s good for you! I try to have a entire day with no set plans (not even with friends). That doesn’t mean I don’t see my friends, it just means there is nothing on my calendar for a whole day each week. Just put a big X on your calendar for one day of each weekend, and if you are invited to something on that day, politely decline.
To read more about the benefits of taking a day off, check out:
The Sabbath Manifesto
What Happened to Downtime?
Do Less: A Short Guide (actually, just read all of Zen Habits, Leo is brilliant)