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I always feel that it's wrong to wish someone 'Good morning' as it approaches noon, Seekerz, since most of the morning has already gone by. My natural instinct (born out of the pedantry that my high-funtioniong autism forces upon me) is to start saying 'Good afternoon' from around 11am. However I usually manage to stick to the social convention of saying 'Good morning' until after lunch.
[See what a boring nerd I can be?]
Anyway, whether it's 'late night' here (as my body clock is telling me) or 'early morning' (or, indeed, 'approaching noon' for you), I feel that it's time for bed.
Good night!
(Er, I mean 'Good morning'. Oh, no I don't, I mean 'Good afternoon'. Oh, stuff it, 'See ya later'!)