Dr. Shelley Tischkau has spent her career as a sleep detective, meticulously piecing together the intricate relationship between our internal clocks and overall health.

Dr. Shelley Tischkau has spent her career as a sleep detective, meticulously piecing together the intricate relationship between our internal clocks and overall health.

Dr. Shelley Tischkau has spent her career as a sleep detective, meticulously piecing together the intricate relationship between our internal clocks and overall health.

Dr. Shelley Tischkau has spent her career as a sleep detective, meticulously piecing together the intricate relationship between our internal clocks and overall health.

Dr. Shelley Tischkau has spent her career as a sleep detective, meticulously piecing together the intricate relationship between our internal clocks and overall health.

Central Illinois residents are encouraged to register for a free skin cancer screening from 5 - 7 p.m., Tuesday, May 20, at Simmons Cancer Institute at SIU Medicine, 315 W. Carpenter St. in Springfield.

Central Illinois residents are encouraged to register for a free skin cancer screening from 5 - 7 p.m., Tuesday, May 20, at Simmons Cancer Institute at SIU Medicine, 315 W. Carpenter St. in Springfield.

Central Illinois residents are encouraged to register for a free skin cancer screening from 5 - 7 p.m., Tuesday, May 20, at Simmons Cancer Institute at SIU Medicine, 315 W. Carpenter St. in Springfield.

Central Illinois residents are encouraged to register for a free skin cancer screening from 5 - 7 p.m., Tuesday, May 20, at Simmons Cancer Institute at SIU Medicine, 315 W. Carpenter St. in Springfield.

Central Illinois residents are encouraged to register for a free skin cancer screening from 5 - 7 p.m., Tuesday, May 20, at Simmons Cancer Institute at SIU Medicine, 315 W. Carpenter St. in Springfield.