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Is insomnia really a problem of modern life... or is the struggle for sleep older than you think? It's a common lament: this new world of smartphones and constant connectivity makes it nearly impossible to get enough sleep. But Shakespeare's characters were up all night, sleepwalking, and freaking out about their daily lives. Just how have our sleeping patterns really changed since the invention of the electric light? Dessa dives deep into the science of sleep to find out what we need, what we're missing, and why it can be so hard to get a full night's rest. See omnystudio.com/listener for privacy information.

Why are we so judgemental about how others beautify themselves? Do you wear eyeliner? Dye your hair? Ever gone under a laser, needle, or knife? When it comes to beautification, how far do you think is too far? And why are there such strong moral overtones to our conversations about where to draw the line? From Instagram Face to pretty privilege, the male gaze to “anti-feminism”, cultural appropriation to the capitalist machine - a tour of the cosmetic cuts surprisingly deep. See omnystudio.com/listener for privacy information.

Why do we hate one another - and how can we stop? How and when does conflict metastasize into hatred? Dessa picks apart the science of hostility, with help from a criminologist who identifies the tipping point between prejudice and hate, and an Israeli psychologist who's studied one of the longest conflicts in the world today. See omnystudio.com/listener for privacy information.

Why do you have all that stuff? What drives us to get and keep so much stuff - even objects that we rarely, if ever, use? Psychologists working on cortisol levels found that living in a messy or cluttered home may correlate to higher rates of depression and that conspicuous consumption may be affecting our well-being. When does your stuff start to own you? Dessa talks with experts about how animal hoarding behaviors compare with our own, and speaks to a money-saving guru who might make you rethink your relationship to things. See omnystudio.com/listener for privacy information.

Why do we form social hierarchies? From corporate ladders to military chains of command, formal caste systems to playground pecking orders, humans are particularly sensitive to social status. And we display our rank in all sorts of ways, even without realizing it - through our posture, vocal pitch, and patterns of eye contact. Join Dessa to learn how social hierarchies are formed, how they might be dismantled, and the many ways in which they color our daily exchanges. See omnystudio.com/listener for privacy information.

Why do you love the way you do? We're expected to love only one romantic partner at a time. But we can love more than one parent, sibling, and friend - so why do so many cultures demand monogamy in romance? Is it time to reconsider the old model? Dessa speaks with a philosopher, an economist, and sexpert Dan Savage to talk about love, sex, and commitment. See omnystudio.com/listener for privacy information.

Why do we use intoxicants?

Why do we use intoxicants? Whether it’s booze, weed, opiates, or even caffeine, the drive to catch a buzz seems almost universal for members of our species. For big parts of the world, drinking alcohol plays a huge role in our social lives, in religious rituals, and in some eras it was even a prerequisite for civic engagement. Find out how the phrase “take him down a peg or two” was derived from a drinking game, which animals consume alcohol, and hear from the professor inventing an alcohol substitute. See omnystudio.com/listener for privacy information.

Why do crowds move us?

Why do we care so much about what people wear?

Why aren’t you naked?

Why do our bodies react to rhythm?