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OrigamiMarie t1_iy3gfn2 wrote

Reply to comment by SeltzerConnoisseur in LPT: Take Vitamin D in the morning, especially if you're having trouble staying awake in the day and sleeping at night by [deleted]

Some people (including me) react to vitamin d with wakefulness. It's not quite like caffeine wakefulness, but it sure keeps me from sleeping for like 4 hours after taking it!

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RJFerret t1_iy3tkw3 wrote

Meanwhile my doc prescribed a high dose, which I take right before bed, no sleep/wake impact at all. Similarly, my SO was prescribed even higher, no "awakeness" impact.

If you're having a reaction before the substance has even made it to your bloodstream, never mind brain, it's likely not due to that substance, but a placebo effect.

That said, continually taking it results in better consistent levels--rendering it meaningless when it's taken as it's always in your bloodstream in sufficient amounts.

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