 According to di WHO report, di Working Group don classify night time work, wey be wen pipo wey no dey sleep di normal time, everybodi dey sleep as e fit dey cancerous to humans on top limited evidence for humans dem, boku evidence of cancer for experimental animals dem and strong mechanistic evidence for di animals wey dem do experiment wey include suppression of immunity, inflammation for bodi and di way di cells dey take ova. 