I have this weird age-related development where, if I go to bed late, I wake up feeling like I’m severely hungover. I can sleep for 6, 8 or 10 hours, it doesn’t matter. It’s not about sleep duration but solely bedtime. I wake up feeling like a bloody wreck. It’s exactly like a bad hangover. Exactly.
But I figured a way to avoid this. And it’s the same as how you avoid a bad hangover. If I stay insanely hydrated all evening and all through the night, I don’t experience this state.
I wish I knew enough about chemistry or biology or whatever to understand how this works. Why do I experience going to bed late like being drunk? This is particularly obnoxious because I was a late-night person my whole life until this started happening. My entire identity is being taken away from me.
Clarissa's Blog 
When you stay up late, are you naturally drinking less water than you normally would unless you make this conscious effort?
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I don’t know, maybe. I never thought about it. Do you think this can be simple dehydration? It feels like absolute crap. Can dehydration be that unpleasant?
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If you read the warnings from endurance athlete forums, dehydration can absolutely be that unpleasant.
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Wow, I had no idea. Thank you, this really helps.
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Have you tried adding salt? For whatever reason, this has a tremendous positive effect on my sleep quality.
-ethyl
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