There's a very good, frustrating reason for this: I took a nap.
Sleep beguiled me with its charms and I fell victim to the age-old trick known as a 'nap'. As I imagined, the nap felt spectacular, as giving in normally does.
Sleep tempted me with promises of eradicating my boredom, relieving a bit of sleepiness, and leaving me perfectly dehydrated. In other words, it was a mighty temptation.
And, as Oscar Wilde remarked in Lady Windermere's Fan, 'I can resist everything except temptation'.
I wholeheartedly concur, Mr Wilde.