Article from the UK Times discusses the problem we’ve all faced.
Sleep is more fatal to performance than any other art form, because it takes place in real time. Doze off when reading and, on waking, you can pick up the book where you left off, mid-sentence. With film or television, one can restart a recording. Performance, however, continues whether you’re watching or not, and there’s no chance to rewind. When you awake, the Thane of Glamis might be Thane of Cawdor and – reports or returns aside – you’ll never know quite how.
Check out the full article.