Russel has extreme insomnia due to his ability to sense and hear spirits
around him. the constant presence of ghosts and the memories of his
past keep him up at night. It was especially bad in phase 3, when he
felt that Murdoc and 2D had abandoned him. Now that he’s back in phase
4, he’s starting to get more and more sleep (if not still being bothered
by the demons in the spirit house from time to time).