3 day weekends are fucking amazing: I got top spend all Friday in bed with a tension headache and still had a weekend after it all!
Sadly, I work in a hospital (not clinically), and the whole sector has been 'set alight' recently, so there's no chance of negotiating a 4 day week
Lots of exercise and feeling hung over as a result which has been great. Days getting lighter, too - long way to go though!