Woke up several times last night feeling like I had low blood sugar or anxiety (I've had both at times pre-pregnancy). I felt that weird almost lightheaded feeling and I could tell my pulse was probably up a little. My husband even made me a midnight snack and then it kept happening. We were very active yesterday and I might have over done it and not had enough water - could that cause something like that? I did feel totally run down by the time we got home after we walked 3 miles after we ran errands all day with our son.