Well, it made it through tuesday night, but wednesday it was moving (to be honest) a lot less. But at least it hadn't got stuck to the sugar water and died. I left it some sugar water on the yellow pages. Yes, I know. Stupid. I had an AMT sachet handy (left by someone unsure about my coffee preferences) so it wasn't like it was any effort or anything ... I'm not going to build it a bee-cage and take it to the botanical gardens like mr_snips suggested, or make a pet of it either, damiancugley.
By lunchtime it wasn't moving at all, so I blew on it, gently. It buzzed back at me in a sleepy, annoyed sort of way. Perhaps it would go back to hibernating? It fought the window, did another hour of distressed buzzing, then settled under the saucer of one of my plants. Not the best hibernation spot -- rather exposed, right in a cold draft ... but I'm not qualified to judge the hibernation needs of a bee.
This morning it was either torpid or dead. Hard to tell with a bee.