1. Follow up the discussion of our sleep equation used by Biddle and Hamermesh (1990) to study the tradeoff between time spent sleeping and working affecting sleep: Simplified Version: sleep do + B totwrk + v Eq(1) where sleep and totwrk (total work) are measured in minutes per week. The simplified version can be extended to be a multiple regression model as: Multiple version: sleep Bo + Ptotwrk + male + B4yngkid + u Eq(2) Where yngkid=1 if childern