Notes and References. 1  U.S. Senate: Reference Home > Glossary > Christmas tree bill. 2  Lardner, George (1966) The Day Congress Played Santa: A Look at the Christmas Tree Bill, Washington Post, 25 December, p. A1, A10. 3  Shribman, David (1983) It Began as a Rather Ordinary Piece of Legislation, New York Times, 9 November, p. A22.
When the individual is awake, blinking of the eyelid causes rheum to be washed away with tears via the nasolacrimal duct. The absence of this action during sleep, however, results in a small amount of dry rheum accumulating in corners of the eye, most notably in children.
The most common cause of eye tics can be attributed to a tic disorder such as Touretteâs syndrome; however other causes may include the following: 1  Stress or anxiety. 2  Extreme fatigue. 3  Side-effects from some medications such as Ritalin, Dexedrine, and Adderall.  Withdrawals from medications such as benzodiazepine.