Sometimes at night I'll put Shiny down on the bed and she'll just start
giggling for no apparent reason, and then *anything* will set her off
for a while...and since she sets me off, well, much hilarity ensues.

I wouldn't guess food...I'd just guess overtired or overstimulated or
working on some developmental leap and it will be 100% different (not
necessarily better or worse) tomorrow.

Unless of course you just started an evening coffee habit...