I suppose it depends what you are doing and what you call boring. Monday is the first day after a weekend of relaxation and it is normally a day of catching up.

I hate Mondays as things normally go wrong somewhere and not much happens. Business seems to happen on Tuesday,Wednesday and Thursdays.Friday is normally a half day as people leave early from work.

I think it is a mindset but Mondays are never boring for me as the day goes way too quickly as I am very busy. If you are bored then maybe it is the job you are doing doesn't have enough challenges or you have outgrown it.