Sometimes it feels REALLY good to "sleep in".
If you are an early riser for your fitness activities, guilt should never be felt if you choose to sleep in versus taking up your workout. You might not be feeling well or you may be fatigued. You just may need the rest. Or you might just have a better offer . . . perhaps do something fun with your family!
Read this post from the "Shut Up and Run" blog and you won't feel guilty the next time you choose to "sleep in".