Life doesn't unfold in consecutive and determined chunks of time that we can plan and schedule. Life happens as it happens and concurrently.
You can't leave your personal life behind completely when you go to work and you can't park all that you do or think about doing with regards to work until you walk back into the office the following day. Life isn't scheduled. Choices are.
If you choose to take on more than is humanly possible to do in a day, then you'll deal with the consequences tomorrow. And if a monkey wrench gets thrown into the equation if you get a flat tire or someone, yourself included, gets sick. You'll have to deal with that too. Either let life happen and choose a path along the way or, at the very least, learn to schedule in your emergencies. Life will still happen regardless.