Our expert says:
Energy, probably, because you might, if that jog was say 8km long, burn 600 to 700 kCal. You might eat properly afterwards, but are you certain of it? Six hours after that run, it's quite possible that you are running low on energy because of your diet. If you run in the afternoon, you eat dinner, you sleep and you never find yourself in that situation.
So I would guess it's energy related, and that means you need to look at your diet. What you eat, how much you eat, and when you eat. For example, if you ate just after running, at 9am, and then again at lunch, you might get to 4pm feeling a bit flat. If you at four smaller meals in that time, it may help. Little things like that often help.
So I'd look at that as a first port of call.
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