Jennifer Aniston suffers from insomnia. The 53-year-old actress has suffered from sleep problems for decades and admitted that she often dreads the thought of spending another night “counting cracks in the walls” as she notices the effects of sleep loss. She said: “I dread spending another night counting cracks in the walls. I think it started somewhere in my 30s or even earlier, but you just don’t start to notice the effects of a lack of sleep when we’re younger because we’re so invincible. It began as something that I would just accept and then all of a sudden you realize the effects of your…