Twenty Years After by Alexandre Dumas Chapter 19 Page 14

But at daybreak he awoke. Wild dreams had disturbed his repose. He dreamed that he was endowed with wings — he wished to fly away. For a time these wings supported him, but when he reached a certain height this new aid failed him. His wings were broken and he seemed to sink into a bottomless abyss, whence he awoke, bathed in perspiration and nearly as much overcome as if he had really fallen. He fell asleep again and another vision appeared.

He was in a subterranean passage by which he was to leave Vincennes. Grimaud was walking before him with a lantern. By degrees the passage narrowed, yet the duke continued his course. At last it became so narrow that the fugitive tried in vain to proceed. The sides of the walls seem to close in, even to press against him. He made fruitless efforts to go on; it was impossible.