Is it bad to have your laptop on sleep mode all of the time?

I would not recommend it. I have read about it being bad for your laptop to be on sleep mode all of the time, especially if you carry it with you while it is on sleep mode. Also, your laptop will get slower after a while.

I think the traveling with your laptop in sleep mode is less of a problem if you have a Solid State Drive (SSD). Never the less, I would recommend at least once a week turning your computer off entirely for a few hours.