It's not uncommon to not realise somethings bothering you, I'd imagine. I find this to be true of myself - unconscious anxiety, stress, anger, sadness. Often other pain is covering it up...like a distraction so I won't have to face what's really bothering me.
Addiction can also be a factor, like other's have said.
I relate to not having a reason and just feeling like it. Reminds me of bordom eating, in a weird sort of way.
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