Hey Scotty,

Loved the article, thanks. Well, I guess I'm due my stooge's tuppence worth.

The first thing is, could it be that the 'emptying out of the hippocampus', as it were, is something that just takes time rather than sleep? I say this because, sure, I'd be tired during the middle of the day when the experimenters did their re-testing, but during this down-time I would typically do some shopping, some admin (I might literally tidy up my inbox) or just relaxing with some friends after lunch. I'd then usually find that after a few hours of distraction my brain is ready for action again: which might suggest that time is the crucial factor rather than sleep.

I'm also wondering if food was involved in the experiments...? I ask because tiredness after lunch is surely related to digestion: either as an aid or a by-product (say from insulin excretion causing lower blood glucose levels: and this would surely impact on cognitive functioning).

My general point is: there may be other factors leading to tiredness during the day, and other ways of riding out the tiredness than sleeping. For now I think I'll stick to my cup of tea and a chat after lunch.

All the best Scotty. Come back to England soon!