Personal? Sure, I don't feel like working today, here you go.
Vacation? Don't mind if I do.
Sick? Ah, the workload I've put up with made my muscles ache, but I'm still able to do other things, I just don't want to work. Here you go.
Know your value and respect your time. Do what you feel you must and take any time off without hesitation. People call it being lazy and disrespectful. I call it taking a damn breather and living.