帰るのがめんどくさかったのと、駐車場が混んでて次来たときに入れるかどうか分からなかったので、車で寝てましたとさ(^^;)

Going back home would've been a pain, and the parking lot so was packed that I didn't know if I could get a space the next time, so I slept in my car. (^^;)