"Severe insomniacs had a higher rate of absenteeism, missing work twice as often as did good sleepers.."
Medical and socio-professional impact of insomnia.
Sleep. 2002 Sep 15;25(6):625-9.
"Absenteeism is one major target in the evaluation of severe insomnia at the workplaceâ€¦The economic impact is severe in term of direct and indirect costs."
Socioeconomic impact of insomnia in working populations.
Ind Health. 2005 Jan;43(1):11-9. Review.