The number of hours photographer Tyler Shields went without sleep. He met his goal to remain awake for 40 continuous days, overcoming fevers, headaches, eye pain and the loss of feeling in his legs. Guinness World Records officials say they won’t recognize his attempt, though, because it’s too difficult to prove and so dangerous to try. If Shields really did go 40 days without sleep, he succeeded in doubling existing sleep deprivation records. He stayed busy by working on new photo shoots and said he found the most difficult part of the whole experience was trying to fall asleep the first time after more than a month without rest.