Because Smith was working at Quick Stop during the day and shooting the film at night, he slept no more than an hour a day. By the end of the 21 day shoot, Smit

Because Smith was working at Quick Stop during the day and shooting the film at night, he slept no more than an hour a day. By the end of the 21 day shoot, Smith was unable to stay awake while some of the most climactic scenes of the film were shot. from: http://en.wikipedia.org/wiki/Clerks http://en.wikipedia.org/wiki/Clerks sleeping an hour a day... :)