Optimism makes me happy

I was surprised by my own optimism (or delusion?) this weekend. At writing group, someone said they'd had a bad week and things were weren't going well. One other person agreed, but myself and another girl took the optimistic attitude. Then, in a lull I thought about my week: my husband's 96-year old grandmother died, I stayed home from work because of a migraine and I was told by my physio that I was unlikely to have a pain-free hip anytime soon (more on that here). Not a stellar week overall, but still my default position was one of optimism – weird!