9. Mattress

Remember the good old days of sleepovers and playing Nintendo until 2 a.m. at your best mate’s house? Yeah, well, those days are gone and so too is your ability to sleep on any couch, floor or mattress. Because choosing the right mattress is almost entirely a matter of personal choice — meaning that most studies on mattress type and back pain, for example, are inconclusive — finding a mattress that works for you is probably best achieved through trial and error.

Don’t be afraid to take notes on the various mattresses that you lay upon throughout your life, whether at hotels or family functions, until you find a perfect match. Of course, you can always use the fact that you’re researching mattresses as a cheesy pickup line.