I had another glimpse of my future when I went to see my dad this afternoon. At 84 years old he'd had a long weekend in the Lake District (not the Peak District as I thought) with my step mother involving a long coach journey each way, three days out doing more each day than he'd normally do in a week, was still totally shattered and just went into deep sleep mid conversation.
I'm using genetics as my excuse for a 15 minute doze on my sofa at home late afternoon.