In the following question a short passage is given with one of the lines in the passage missing and represented by a blank. Select the best out of the five answer choices given, to make the passage complete and coherent.

On all of the days during the week when I do not exercise (Tuesday, Thursday, Saturday, and Sunday), I set my alarm for 6:00 a.m., and when the alarm goes off, I try to get up immediately. I need about six-and-one-half to seven hours of sleep each night.  I can do with less, but too less will make me feel groggy during the day, and sometimes during the late afternoon, I may even fall asleep briefly as I sit in the chair at my computer or at my desk.  Since I hate that feeling of grogginess, I try to ________________________.