Sleeping Habits

Someone got angry with me today because I was asleep when they kept calling. I have to wonder, should I feel guilty about my sleeping habits? You see, I work late at night because for one, I'm a night owl. But the other reason is that it's easier for me to get things done late at night. I can work on sites without distractions, I can do mp3's without the dogs barking or the phone ringing and I can do my freelance writing without worrying that someone will come to the door.

However, this means I sleep late in the daytime. Sometimes I'm up early but usually it's at least after 12 or 1 before I get up and sometimes even later.

So, should I feel guilty about when I choose to go to bed because it's unconventional to someone else or should I just say that it's my life and I can live it however I want?