1. Kryger M, Shapiro CM. Pain and distress at night. Sleep Solutions1992;5:1–20.
2. Wooten V. Medical causes of insomnia. In: Kryger MH, Roth T, Dement WC, eds. Principles and practice of sleep medicine. Philadelphia: WB Saunders, 1994:509–22.
3. Drewes AM. Pain and sleep disturbances. Clinical, experimental, and methodological aspects with special reference to the fibromyalgia syndrome and rheumatoid arthritis (Thesis). Aalborg: Aalborg University, Denmark, ISBN 87-90562-00-3. (Requested at e-mail: smi-request@miba.auc.dk).
4. Moldofsky H. Sleep and musculoskeletal pain. In: Værøy H, Merskey H, eds. Progress in fibromyalgia and myofascial pain. Amsterdam: Elsevier, 1993:137–48.
5. Kryger MH, Roth T, Carskadon M. Circadian rhythms in humans: an overview. In: Kryger MH, Roth T, Dement WC, eds. Principles and practice of sleep medicine. Philadelphia: WB Saunders, 1994:301–8.