There's a reason you dread looking at the stacked blue, yellow and green blocks on your Google calendar.

Feeling too busy, or like you don't have time to do what you want, can lead to "time famine," according to Yale University psychology professor Laurie Santos. Time famine can lead to poorer work performance and burnout, and is just as harmful to your mental health as being unemployed, Santos told attendees at SXSW earlier this month.