Marsden, who showed off his singing chops in the 2007 movie “Hairspray,” added: “There’s a real joyous nature to Sterling … we bonded over some ’90s R&B. There was a lot of singing on set.

These symptoms, which affect your ability to think, are often collectively described as “brain fog”, a non-medical, colloquial term. There are many potential causes of “brain fog”, but one ...