Because of poor lighting, among other things, in Shakespeare's day plays were performed during the day. That was why theaters like The Globe had no roofs, so that the sun could light up the stage. It wasn't until much later that performances became a night-time affair.
When the Doctor witnesses Lynley die - of a psychic attack that causes him to drown on dry land, his lungs full of water - he declares that he has never seen anything like it. In fact, the Doctor has seen a death almost exactly like it in the 1971 serial "The Mind of Evil", in which the victim was, likewise, found dead in a dry room, his lungs full of water.