Dehydration and caffeine withdrawal
About one-third of people who get migraine attacks note dehydration as a trigger.
Obviously, you can’t drink water while you’re asleep, so it’s possible that waking up dehydrated is a reason why people are more prone to getting migraine attacks in the morning.
The wee hours of the morning also tend to mark a full day since your last caffeine fix. Coffee and other forms of caffeine dilate the blood vessels in your brain, relieving tension. And caffeine withdrawal has been connected to migraine attacks.
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