What was I thinking?

I went to bed last night at 1 only to wake up at 7, what was I thinking?
I had a cavity that needed to be filled a year ago and waited until now to fill it, what was I thinking?
I chose to work full time and be in school every night, what was I thinking?
I bought a dress because it was 75% off but I have yet to wear it, what was I thinking?
I made a phone call in my car the other day while driving and got a ticket, what was I thinking?
I threw away a receipt to clothes I meant to return to the store the next day, what was I thinking?
I decided to visit friends one weekend 3 hours away when I had a final to study for, what was I thinking?
I bought a one way airline ticket and forgot to buy the return trip, what was I thinking?
I got a 95 on my first Bio test and a 65 on my second, what was I thinking?
Apparently I wasn't.

( most of these are true but some are not, can you find the ones I lied about? ) :)