The comedian Louis C.K. has a riff that’s been watched nearly eight million times on YouTube in which he describes that not-good feeling. “Sometimes when things clear away and you’re not watching anything and you’re in your car and you start going, oh no, here it comes, that I’m alone, and it starts to visit on you, just this sadness,” he said. “And that’s why we text and drive. People are willing to risk taking a life and ruining their own because they don’t want to be alone for a second because it’s so hard.”

But you can’t solve or let go of problems if you don’t allow yourself time to think about them. It’s an imperative ignored by our culture, which values doing more than thinking and believes answers are in the palm of your hand rather than in your own head.

“It’s like we’re all in this addicted family where all this busyness seems normal when it’s really harmful,” said Stephanie Brown, a psychologist in Silicon Valley and the author of “Speed: Facing Our Addiction to Fast and Faster — and Overcoming Our Fear of Slowing Down.” “There’s this widespread belief that thinking and feeling will only slow you down and get in your way, but it’s the opposite.”

Suppressing negative feelings only gives them more power, she said, leading to intrusive thoughts, which makes people get even busier to keep them at bay. The constant cognitive strain of evading emotions underlies a range of psychological troubles such as obsessive-compulsive disorder, anxiety, depression and panic attacks, not to mention a range of addictions. It is also associated with various somatic problems like eczema, irritable bowel syndrome, asthma, inflammation, impaired immunity and headaches.

Studies further suggest that not giving yourself time to reflect impairs your ability to empathize with others. “The more in touch with my own feelings and experiences, the richer and more accurate are my guesses of what passes through another person’s mind,” said Giancarlo Dimaggio, a psychiatrist with the Center for Metacognitive Interpersonal Therapy in Rome, who studies the interplay of self-reflection and empathy. “Feeling what you feel is an ability that atrophies if you don’t use it.”

Researchers have also found that an idle mind is a crucible of creativity. A number of studies have shown that people tend to come up with more novel uses for objects if they are first given an easy task that allows their minds to wander, rather than a more demanding one.

“Idle mental processing encourages creativity and solutions because imagining your problem when you aren’t in it is not the same as reality,” said Jonathan Smallwood, a cognitive neuroscientist at the University of York, in England. “Using your imagination means you are in fact rethinking the problem in a novel way.”