I wouldn’t lose a lot of sleep over this study.
—
National Center for Health Statistics:
http://www.cdc.gov/nchs
American Academy of Sleep Medicine:
http://www.aasmnet.org/
“it’s not clear if smoking causes sleeplessness or if sleeplessness prompts smoking”
Well, that clears it up nicely!
/johnny
Obesity can cause insomnia via sleep apnea. The researchers may be confusing cause and effect. But that’s not unusual.