I'm the same as you on the daylight front during the working day even though I'm on the South Coast. I've just started going for a 20-25 min walk at luchtime and it makes a huge difference. I fell better and am more alert during the pm also cutting all the bad carbs has stopped the post lunch narcolepsy too! Looking forward to getting my Vibrams tomorrow (boss got them for me in USA) and to hell with the funny looks!!!
On the weight front I snack too when bored and that's where most of my weight came from (that and red wine) I have tried to cut down on the nuts during the day. If I'm really bored then I go for a 5 minute wander and then get back to work, a little non-fag break seems to work for me!
Bought the book Oct 2nd 2011
Went Primal Oct 3rd
Stats Jan 27