After eating 6 grapes I got so sleepy, almost a drugged sleepy. Is this dumping?

After dinner tonight (4 bites of turkey breast & mashed potatoes) I wanted something sweet and had about 6 green grapes. They tasted wonderful and went down well. After about 20 mins I suddenly got SO tired that I HAD to lay down and take a nap. After an hour of sleeping I was woken up but I feel so groggy still. Almost like a drugged feeling. Is this part of dumping? I don't like it very well whatever it is. Bananas gave me the same reaction a few weeks after surgery. All other fruit has been fine to eat. Thanks for any help.

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