The Doctor was sleeping. He was curled up in his bed. He snored a bit. He hadnt intended to sleep as long as he did. But he was so tired. He was also unaware of the destination the TARDIS was taking him. He had picked at random.
He awoke and gets up and looked around. He had no idea they were going somewhere extremly dangerous.
They were been drawn to place that time lord's not allowed. As soon as that desintion was picked they were unable to turn back from it.