Why do I always get terrible headaches or feel dizzy after I wake up?

[xxNDMxx]

I get enough sleep.

[Realfire22]

You may have sleep apnea like I do. It's where you're sleeping a certain way that blocks off your oxygen from your brain. So when u wake up, you feel dizzy from lack of oxygen.

[ksoma]

do you sweat a lot in your sleep?
the reason i ask is that dehydration can cause headaches. that's actually most of what a hangover is: alcohol caused dehydration.

[broadsword]

Hydration or vertigo. Many of us don't drink enough especially before going to bed we don't want to get up for a pee.

[stevethepervert]

I am not a doctor, so can only go on my own experience.

De-hydration.

The simplest way too check is too look at the color of your pee. The less color it has the better.

[Realfire22]

This could be it too.