One of my close friends a few years ago I woke up from my nap and called her, took her a few minutes to answer and I'm chatting away and she said 'do you know what time it is?' '3 o clock.' 'In the morning!!!" We often laugh about it now : )I just took a nap and when I woke up for a minute I didn't know if it was am or pm. Kind of freaked me out. Can anxiety cause this?