Waking up dizzy?

Aubrey • 26, married 06/2013, 1st babe born 9/17/2017 💜, 2nd babe born 4/20/2020 💜
For the past couple days when I wake up in the morning I feel really dizzy. When I get up and walk it's like I've had a little too much to drink. It's like my brain is spinning around inside my skull. It gets better the longer I'm awake and walking around but it's really annoying when I first wake up. What could be the cause of this?