From the following website/page: http://www.24sleepwake.com/index.php/resources/frequently_asked_questions#what_is_non_24_hour_sleep_wake_disorder_non_24 "Non-24 is a chronic sleep disorder that affects approximately 50% of totally blind people. Their inability to perceive light causes a severe disruption of the 24-hour sleep-wake pattern causing cyclical bouts of nighttime sleeplessness and excessive daytime fatigue and napping. The disorder can make it extremely difficult to do well in school, hold down a job or have satisfying relationships. Non-24 has been called an ?invisible disability,? and can go undiagnosed for years." Will, just, personally say I've always been one of those for whom 6 hours sleep is a looong night - even in sighted days, but anyway. Stay well Jacob Kruger Blind Biker Skype: BlindZA '...fate had broken his body, but not his spirit...' ---------- To send a message to the list, send any message to blindza@xxxxxxxxxxxxx ---------- To unsubscribe from this list, send a message to blindza-request@xxxxxxxxxxxxx with 'unsubscribe' in the subject line --- The 'homepage' for this list is at http://www.blindza.co.za