It is unfortunate that Insomnobabble should arrive in Edinburgh at the same time as Anthony Neilson's Realism, as both are based on the same premise.
Keith cannot get to sleep and we spend a night in his company, as he dreams of sleeping or sleeps in his dreams.
The company use every theatrical trick imaginable to explore Keith's life through his dreams and are often extremely funny, particularly the minutiae of the working day. This owes a lot to Matt Rutter playing Keith and the John Cleese-like Tim Lynskey playing Everybody Else, as his name badge makes clear.
Anarchic and zany are the words for this comedy that for 45 minutes is irrepressibly funny but then become rather wearing as the same techniques are repeated several times too often.