Perform a work sampling study of your own activities during each day of the workweek (a minimum of 4 days). You decide on the basic activity categories: eating, traveling, studying in class, and gym. Compute the number of observations required and collect and record the data.

I'm having trouble understanding how the work sampling works

If one of the activities is sleep: Day 1 - 7hrs, Day 2 - 6hrs and 30mins, Day 3 - 8 hours, and Day 4 - 7 hours