Our expert says:
It's actually not uncommon - a lot of people experience it even after really hard training days. I'm not sure why it happens - I'd speculate that it's related to the hormonal and neural changes that happen during exercise, and then persist for hours, even days afterwards. Much like you can get muscle damage that lasts for 3 to 4 days, the effects of a particularly hard bout of exercise do last long. And 56 km is a tough run. So my guess is that inflammation, plus neural activity are probably changed after the race, and that's what keeps you awake.
So sleeping tablets are the obvious answer, though obviously you don't want to rely on them. Anti-inflammatories, if the theory is correct, would help, but that too is treating the symptom and not the cause. So unfortunately, there's probably nothing you can do to prevent it, only manage it if it does happen.
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