Last night, i wore a new night guard for my teeth grinding. i woke up with dizziness and a little nauseau. are these symptoms from night guard?

Probably not...: All nightguards are not created equal. Is it hard or soft? Should be hard. How much time did the dentist spend fitting/adjusting it to your bite and teeth? At least 15 minutes or i would be concerned.

No, not Realy: Your symptoms suggest dehydration. Avoid alcohol before sleep, drink 6-8 glasses of non-caffeinated fluids a day. You can get adjusted to your bite block wearing it 1/2 the night, increasing it as tolerated. Dizziness almost always has some nausea with it, if it persists you will need to have your ears examined.

Not usually: It sounds like something else is going on. I would have the night guard checked by the dentist who made it.

May be: Most of the night guard are fabricated base of guessing work and they are not only they do not correct the issue but also cause discomfort. My advise to you find a neuromuscular dentist in your area. To fabricate you a physiologic bite splint, since they utilize computer and tensing units to precisely determine your jaw position.

Possible?: Yu might be grinding a lot with the introduction of this new mouth guard to your mouth. Monitor for the next few days, if it doesn't get better slowly, consult your doctor.