Commercial programmer, full-time, some remote, some office. No alarm clock, watch, or cell phone. I don't know what time it is except for outlook meeting reminders or SO telling me it's time for dinner, Jeopardy, or Penguins or Steelers game. Same routine for years:

  - Cats wake me up when it's light. I feed them.
  - Bike ride on trails, 5 to 13 miles.
  - Shower
  - fresh fruit, coffee, salad, grazing off & on all day
  - check & resolve all personal email
  - check & resolve all work email
  - check headlines
  - check work queue (Visual Studio)
  - review last night's notes
  - spend most of the day in IDE, writing code, unit testing
  - take a break every hour or 2 for email, VSO, snack, Hacker News, twitter, lichess
  - attend meetings when outlook reminds me
  - dinner with SO, reminded with, "Two minute warning!"
  - check & resolve all email (I end every day at email zero.)
  - Jeopardy with SO
  - no more computer
  - print source code, review, & mark up in red
  - write down tomorrow's To Do List
  - read other stuff
  - lights out