John Noble, who plays quintessential mad scientist Walter Bishop in the sci-fi series Fringe, has opened up about a sleep disorder that has stopped him spending quality time on his mattress. Speaking to Entertainment Weekly, the 63-year-old actor said filming on the drama was forced to stop in July because of his combination of insomnia and sleep apnea, which led to him being hospitalised. "I couldn't even think... I was working and going: 'This is really hard'," he told the magazine. The Australian, who also played Denethor in the Lord of the Rings trilogy, added: "I basically hit a wall, and we had to deal with it. I went to the hospital, had all the tests, and we put the strategies into place to deal with both of those issues, including the space-age mask that I wear to bed now. It's pretty unsightly." Noble said he has now returned to work and is getting better bed rest than ever. Insomnia and sleep apnea have a variety of causes, ranging from physical condition to mental state. Anybody suffering from either for a prolonged period of time is advised to contact their doctor and find out if there is a solution - even if it's just a more comfortable bed!