Mackrell's 'Sleep' is not to be confused (but inevitably ends up in bed with) Andy Warhol's 1963 film of Taylor Mead. A frustration at the practical impossibility to create whilst asleep is overcome and shown within a keep-you-awake light box on tells-the-truth carbon paper.
What you think would be inaction (especially if you have watched Warhol's 'Sleep') is a bona-fide action painting, as restless as Mackrell's constantly shifting practice. It is completely un-self-conscious, made whilst unconscious, primitive mark-making with a formalist strategy (complete with a formalist grid of the joined-together paper).