If you're diligently planning an early workout, even though it's now 1am, you're probably doing yourself more of a disservice than you think. Research shows that less than seven hours of sleep a day can make you unfocused, irritable and forgetful, which can affect your performance as well as the people around you (ie make you volatile). One late night and one missed workout is not going to make a huge difference to your overall progress. So you have official permission to hit snooze and get adequate sleep. Just try to keep active during the day.