This article claims that drinking the popular energy drink called Celsius will cause brain fog, exhaustion, mental lapses, and fatigue.
The article is not focused on the brand Celsius but on caffeine and coffee in general even though the title addresses Celsius specifically. Due to its current popularity, the chance of people clicking on the article is higher due to Celsius being in the title.
There is a lot of focus on the effects of caffeine and how it stays in the body referenced by the Cleveland Clinic article which very briefly focuses on the symptoms with a completely different topic in the majority of the article. Most other references including the Journal of Clinical Sleep Medicine were more credible but the article did not focus on the whole thing, only small parts sometimes completely ignoring other data.
This article was not very focused and the title was misleading. It didn't even clearly answer the claim due to a lack of details and evidence.