Usually I don't have trouble sleeping, but I still experience ''morning grogginess''. It's different to what I experience after a nap though. Each morning I never feel like breakfast, and if I do eat first thing after getting up, I tend to take ages eating it because it seems everything I look at makes me feel sick. This strange feeling goes away throughout the morning, especially after having a bit of fresh air and exercise, then I can eat in any sort of environment without anything making me feel sick.
Also, if I get up too early (when it's still dark, or right at sunrise in summer), I tend to feel nauseas, and it grows worse and worse, until I end up heaving (but not actually being sick). After heaving, the nausea ebbs off slowly, then my stomach starts having that healthy hunger sensation. But that only happens if I get up really early, and especially if I am to go travelling straight away. I think it's because my body is confused when I'm up too early.
By the way none of this is an Aspie thing - it happens to most NTs I know.
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Female