Of course beyond the obvious cases (like booking flights, or perhaps some work-related things), strive to never schedule a day in advance. This means, with any of your personal, life, health, fitness, art, creativity things … attack every day, day by day as it comes!
Don’t become a slave to Google Calendar
What’s the downside of scheduling things in advance? Many. You feel anxious, frustrated or stressed when you wake up feeling like shit, and not having the energy or time to pursue everything in your day. It is unknown what time you’ll sleep tonight, when you slept yesterday, or when you will wake up, and how you will feel when you wake up.