Sleep deprivation can be a problem in theater generally: actors have day jobs, then rehearse or perform at night; the same for running crew and board ops; producers ditto; while carpenters and painters work long hours during the Build, usually starting early; and prop designers or costumers just flat have so much to do that they skip sleep...
Theater set designers have the problem of starting early, to look in on and coordinate with builders and painters, but also spending hours finding, creating, or modifying set dressing, then staying up late to watch rehearsals or pop in afterwards for notes. Some theaters, some of the time, ease this by sending out set notes as emails, but at others (and part of the time anywhere) the designer just needs to physically be there for discussion.
By the time Opening arrives, everyone involved in a production is getting a little punchy.
Crib * Molineaux - public domain image, messed with