I have not yet properly begun freelancing (however I am working quite hard on side projects).
I was getting - more - overweight but since I quite the 9 to 5 I have lost 6kgs and it's only going down.
I'm not sleep deprived I sleep when I feel like it and wake up when it feels natural. I no longer get depressed on a Sunday night thinking about how I'm going to tolerate another week until I get a good chunk of time to myself again in the weekend.
I do what feels natural I work hard then take a nice quick shower, then lie down for a while, do more work whatever, I'm only accountable to myself. I can go take a walk around the park while thinking about how to solve a problem and that's a win win. I don't have to worry about the "perception" like you do when you are clocking in and out.
I was a bit afraid that I'm going to feel lonely however that hasn't happened at all. I'm saving my commute time and public transport cost.
I hope I can sustain this because I can really hardly imagine myself going back to an office 9 to 5.
And hell my job wasn't even a bad one by all standards.
I think my personality is deeply incompatible with the 9 to 5 life so I just with I never have to go back to it again.