Many situations in life that are supposed to be fun also involve a high degree of uncertainty: dates with strangers, rollercoasters with unpredictable twists and turns, unrehearsed karaoke. For those of us who like to be able to see what’s coming, many of these potentially enjoyable opportunities may as well have warning signs hanging over them. Sometimes it’s tempting not to take the risk. But I recently came across a study that made me wonder if I should challenge myself more often.

The researchers, including members of the Recreational Fear Lab at the University of Aarhus in Denmark, surveyed visitors to Dystopia Haunted House – one of those immersive attractions where you wander past menacing costumed actors, not knowing what will pop out next. Before they went in, the participants completed some questionnaires, including one tapping their intolerance of uncertainty. (They rated how much they agreed with statements like ‘I can’t stand being taken by surprise’ and ‘Uncertainty keeps me from living a full life’.) As you might expect, visitors who were less tolerant of uncertainty had dimmer expectations about how the haunted house would hit them. They anticipated less positive emotion and more anxious and generally negative emotions than the uncertainty-tolerant did. And yet, afterwards, visitors across the board (including the uncertainty-averse ones) reported feeling more positive emotions and less unpleasant emotions in the haunted house than they predicted they would.

In other words: despite the frightening surprises they’d encountered, it wasn’t so bad after all. It seems that for me and other certainty-craving people, the real problem might not be the ghoul hiding around the corner or the possibility of singing off-key at the karaoke bar, but our pessimism about how it’ll make us feel.

Over the past decade or so, there has been a huge shift in our attitude to sleep in the Western world. We’ve moved from ‘I’ll sleep when I’m dead’, ‘Sleep is for wimps’ and ‘Money never sleeps’ to scientists, doctors and health bloggers alike emphasising the huge importance of getting our Zzzs.

It’s positive that people now take sleep more seriously but, as a sleep researcher myself, I fear things have gone too far. Increasingly, many people, who by any objective measure are getting enough sleep, are worrying unnecessarily that their sleep is not ‘good enough’. In 2017, a group of US sleep experts coined the term ‘orthosomnia’ to refer to a desire for ‘perfect sleep’. They described how people are now arriving at clinics clutching a sleep tracker or a popular science book, explaining that they had always considered themselves to be good sleepers until…

Another unexpected consequence of so much promotion about the importance of sleep is that people who, for reasons outside of their control, are struggling to get enough sleep are becoming increasingly distressed about it. This applies to many people in society but, as one example, consider those who care for others with disabilities that require around-the-clock monitoring or support, and who therefore miss out on what my colleagues and I call ‘sleep privilege’ – the luxury, enjoyed by some, to sleep under optimal circumstances and conditions.

Yes, sleep is undoubtedly important, but dramatic headlines stating it is the most important factor for health, or that too little sleep can be devastating, are typically unwarranted, and it seems that its value might be beginning to be overinflated. Looking ahead, could it be that some of the challenges caused by undervaluing sleep will be replaced by those linked to overvaluing it?