Back to work blues

There are too many variables in life (including sleep quality, intake of caffeine, the weather, likely Seasonal Affective Disorder, lingering sniffles, impatience with trains etc.) that can affect day-to-day or hour-to-hour happiness, which make it hard to know your baseline happiness and which can be quite destabilising. These variables are replaced by others on any given day so it's impossible to know what causes a happier feeling, unless it's purely random brain reactions leading to comparatively higher or lower mood and happiness. 

I very much enjoy my job so I honestly have no idea how those who loathe theirs get out of bed in the morning. It's hard enough peeling back that warm duvet when I genuinely have a good time in our office and usually see plenty of friends through the day.

These could be the ramblings of a recently-returned brain which has been addled by a dull, damp climate. But I would like to read more on this kind of stuff. Book recommendations welcome.

In Cambridge city centre there was someone busking by banging a metal pen against a saw. Busking standards have gone down...