feeling no motivation today

have you ever had a time where you go to sit down and try to do a piece of art and just feel so lazy that you can't focus. Yea thats pretty much me today. I went to do my fourth piece and nothing... probably artists block. I hope i can get somethin going today, but if not tomorrow. I think i may get all my sketches done before i do the finished work. Ive decided that i'll do a one point perspective of the side of the car; its definately going to be tougher than it looks but hopefully it'll get done by the end of this weekend.